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Why Are All Humans Unique? Meiosis: Crash Course Biology #30

Video vocabulary

alternate

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US / ɔ:lˈtɜ:nət /

UK / ˈɔ:ltərnət /

B2
  • verb
  • To follow one thing after another repeatedly

development

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US / dɪ'veləpmənt /

UK / dɪˈvɛləpmənt /

A2
  • noun
  • Act or process of growing bigger or more advanced
  • A new event related to a previous event

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

lone

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US / ləʊn /

UK / lon /

B2
  • adjecitve
  • Being alone or the only one; single

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

reproduce

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US / ˌri:prə'dju:s /

UK / ˌriprəˈdus, -ˈdjus /

B1
  • verb
  • To make a copy of something
  • To have children/young; grow roots/new plants

themselves

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US / ðəmˈselvz /

UK / ðɛmˈsɛlvz, ðəm- /

A1
  • pronoun
  • Reflexive form of 'they'

survive

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US / sə'vaɪv /

UK / sɚˈvaɪv /

A2
  • verb
  • To continue to live despite illness or trouble

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

bye

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US / baɪ /

UK / baɪ /

A1
  • exclamation
  • Saying farewell to someone

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

good

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US / ɡʊd /

UK / ɡʊd /

A1
  • adjecitve
  • Proper, appropriate or right
  • (Of an amount) enough; plenty
  • Excellent; high quality
  • Acting well or properly; of moral character
  • In a positive or happy emotional state
  • noun
  • Advantage or benefit

life

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US / laɪf /

UK / laɪf /

A1
  • noun
  • All the living things e.g. animals, plants, humans
  • Period of time things live, from birth to death

nobody

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US / ˈnəʊbədi /

UK / ˈnoʊbədi /

A1
  • pronoun
  • No person; no one; not any person

ovary

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US / ˈəʊvəri /

UK / ˈoʊvəri /

C1
  • noun
  • Egg-producing organ of female humans and animals

single

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US / 'sɪŋɡl /

UK / ˈsɪŋɡəl /

A1
  • adjecitve
  • Being one only, without others
  • Only; merely
  • Not married or in a relationship
  • noun
  • One run in cricket or a hit baseball
  • An individual song from a CD or album
  • Person who is not married or in a relationship

friend

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US / frend /

UK / frɛnd /

A1
  • noun
  • Person who you like and enjoy being with

genome

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US / ˈdʒi:nəʊm /

UK / ˈdʒi:noʊm /

B2
  • noun
  • Complete set of genetic material in an organism

measure

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US / ˈmeʒə(r) /

UK / ˈmɛʒɚ /

A1
  • noun
  • Plan to achieve a desired result
  • Tool used to calculate the size of something
  • verb
  • To determine the value or importance of something
  • To calculate size, weight or temperature of

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

ish

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US / ɪʃ /

UK / ɪʃ /

A1
  • abbreviation
  • ISH is an acronym

membrane

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US / 'membreɪn /

UK / ˈmɛmˌbren /

B2
  • noun
  • Outside covering of a cell
  • A thin covering of tissue or of a cell

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

stock

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US / stɒk /

UK / stɑk /

B2
  • adjecitve
  • (E.g. of a response) standard; usual; not original
  • noun
  • Animals such as cattle kept for breeding
  • Tasty liquid added to stews, soups etc.
  • Merchandise; goods kept by a business for sale
  • Piece of a business, bought in the form of shares
  • verb
  • To keep some of, as items for sale

carry

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US / ˈkæri /

UK / ˈkæri /

A1
  • verb
  • To have a child, be pregnant
  • To have a disease you might give to others
  • (Of stores) to sell a particular product
  • To hold something and move it to another place
  • To travel a long distance (sound)
  • To support the weight or burden of something

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

sport

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US / spɔ:t /

UK / spɔː(r)t /

A1
  • noun
  • Something that is done for fun, e.g. football
  • Game or physical exercise with rules
  • Someone with a good attitude when things go badly
  • verb
  • To do something for fun, e.g. playing with animals
  • To wear, or show something off by wearing it

comically

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US / 'kɒmɪklɪ /

UK / ˈkɑmɪkl:ɪ /

B1
  • adverb
  • In a way that makes you laugh

business

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US / ˈbɪznəs /

UK / ˈbɪznɪs /

A1
  • noun
  • A company formed for making profit
  • Matter that has to be dealt with; task; situation
  • Activity of working to make a profit

ova

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US / /

UK / /

C1
  • noun
  • (Biology) the plural of ovum

represent

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US / ˌreprɪ'zent /

UK / ˌrɛprɪˈzɛnt /

A2
  • verb
  • To depict art objects, figures, scenes; to portray
  • To show or describe something in a particular way
  • To act on behalf of others in government
  • To act or speak for another person or other people

ranch

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US / rɑ:ntʃ /

UK / ræntʃ /

B1
  • noun
  • Large farm, made mostly of land for raising cattle
  • verb
  • To do the work of raising cattle

round

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US / raʊnd /

UK / raʊnd /

A1
  • adjecitve
  • Being in the shape of a circle or ball
  • Consisting of curved and not straight lines
  • Somewhat fat or curved in physical appearance
  • Being a whole number, not a fraction, decimal
  • adverb
  • From beginning to end (e.g. of the year)
  • noun
  • One of the three-minute periods in boxing
  • Drinks bought by one person for a group
  • Series regular visits, routes, or stops at places
  • Single shot or bullet fired from a gun
  • An object with a circular shape
  • One stage in a series of games, e.g. football
  • One's turn in a game such as cards
  • preposition
  • Going around
  • verb
  • To cause or make a circular or curved shape
  • To go or pass around the bend or corner
  • To change from a fraction to nearest whole number

surprise

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US / səˈpraɪz /

UK / sərˈpraɪz /

A1
  • adjecitve
  • That surprises you; not expected
  • noun
  • Something unexpected that slightly shocks you
  • verb
  • To do something that another person didn't expect

copy

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US / ˈkɒpi /

UK / ˈkɑ:pi /

A1
  • noun
  • A counter for items that are the same
  • Fake product pretending to be an original
  • An imitation of an original
  • A duplicate of a paper printed in a photocopier
  • Written text for printing, use in ads, etc.
  • verb
  • To make something look the same as the original
  • To act in the exact same way as someone else
  • To read and then write down what you read

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

mingle

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US / ˈmɪŋgl /

UK / ˈmɪŋɡəl /

B2
  • verb
  • To mix or come into contact, as people at a party

seven

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US / ˈsevn /

UK / ˈsɛvən /

A1
  • number
  • Number 7

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

across

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US / əˈkrɔs /

UK / əˈkrɔs,əˈkrɑs /

A1
  • adverb
  • Distance from one side to another
  • (Go) from one side to the other of something

free

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US / fri: /

UK / fri /

A1
  • adjecitve
  • Living, happening without being controlled
  • Costing no money
  • Not working; not busy
  • verb
  • To release (e.g. bird) from a cage or prison

ready

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US / 'redɪ /

UK / ˈrɛdi /

A1
  • adjecitve
  • Being likely or about to do something
  • Being willing to do a task
  • verb
  • To prepare something for use or action

stranger

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US / 'streɪndʒə(r) /

UK / ˈstrendʒɚ /

A2
  • noun
  • Someone you do not know

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

cha

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US / tʃɑ: /

UK / tʃɑ: /

A1
  • noun

body

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US / ˈbɒd.i /

UK / ˈbɑdi /

A1
  • noun
  • An object distinct from other objects
  • A group of people involved in an activity together
  • Main part of something
  • A person's physical self

outside

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US / ˌaʊtˈsaɪd /

UK / aʊtˈsaɪd, ˈaʊtˌsaɪd /

A2
  • adverb
  • Beyond the limits or edges of some place, thing
  • noun
  • Area around or near something, such as a building
  • preposition
  • Beyond the limits or edges of some place, thing

run

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US / rʌn /

UK / rʌn /

A1
  • noun
  • Journey between two places made by ship or car
  • Series of similar things or successes and failures
  • Act of running; exercise of running
  • verb
  • To depart or travel according to a schedule
  • To cause an animal to move in a certain direction
  • (Of an engine) to be operating
  • To start or use a computer program
  • To flow in a certain direction, like a liquid
  • To manage or operate a business
  • To operate or drive something
  • (Of a road) to go from one place to another
  • To move your legs faster than walking

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

universe

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US / ˈju:nɪvɜ:s /

UK / ˈjunəˌvɚs /

B2
  • noun
  • All of space that contains planets and stars
  • Things surrounding a person, affecting their life

wrench

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US / rentʃ /

UK / rɛntʃ /

B2
  • noun
  • Tool for holding/turning objects of varying sizes
  • verb
  • To twist, turn, or pull suddenly and forcibly

classroom

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US / ˈklɑ:sru:m /

UK / ˈklæsˌrum, -ˌrʊm /

A1
  • noun
  • Room in a school where lessons take place

clump

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US / klʌmp /

UK / klʌmp /

B2
  • noun
  • Mass or pile of something such as soil
  • Small group of trees, etc. growing near each other

also

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US / 'ɔ:lsəʊ /

UK / ˈɔlso /

A1
  • adverb
  • In addition; too; in a similar way

dire

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US / ˈdaɪə(r) /

UK / daɪr /

B2
  • adjecitve
  • (E.g. of consequences) very serious

female

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US / 'fi:meɪl /

UK / ˈfiˌmel /

A2
  • adjecitve
  • Person of the sex that gives birth to babies

five

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US / faɪv /

UK / faɪv /

A1
  • number
  • 5

kind

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US / kaɪnd /

UK / kaɪnd /

A1
  • adjecitve
  • In a caring and helpful manner
  • friendly and considerate
  • noun
  • One type of thing

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

live

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US / lɪv /

UK / liv /

A1
  • adjecitve
  • Being broadcast as events happen, not recorded
  • Carrying electric current; able to give a shock
  • Glowing because burning; hot
  • Not yet killed (for food)
  • adverb
  • (Music, drama) as it is performed
  • verb
  • To be alive
  • To experience a particular type of life
  • To make your home in a house or town

simply

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US / ˈsɪmpli /

UK / ˈsɪmpli /

A1
  • adverb
  • In an easy or clear manner

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

able

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US / 'eɪbl /

UK / ˈebəl /

A2
  • adjecitve
  • Skilled; good at something
  • Having the ability to do something

fertilize

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US / ˈfɜ:təlaɪz /

UK / ˈfɜ:rtəlaɪz /

B1
  • verb
  • To make pregnant; to put sperm in an egg
  • To add chemicals to produce larger, better plants

germ

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US / dʒɜ:m /

UK / dʒɚm /

B2
  • noun
  • Tiny organism that can cause sickness and disease

multiple

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US / ˈmʌltɪpl /

UK / ˈmʌltəpəl /

B1
  • adjecitve
  • Having or involving more than one of something
  • noun
  • Number produced by multiplying a smaller number
  • Shop with many branches

visible

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US / ˈvɪzəbl /

UK / ˈvɪzəbəl /

B1
  • adjecitve
  • Can see, easily seen or understood
  • Being obvious or easy to see

three

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US / θri: /

UK / θri /

A1
  • number
  • Number 3

broad

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US / brɔ:d /

UK / brɔd /

A2
  • adjecitve
  • General; not detailed
  • Wide; from the shorter two sides to the other

giant

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US / 'dʒaɪənt /

UK / ˈdʒaɪənt /

A2
  • adjecitve
  • Very large, or much bigger than other things
  • noun
  • Tall, large, and powerful human-like creatures
  • Very successful, powerful person or organization

sperm

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US / spɜ:m /

UK / spə:m /

C2
  • noun
  • Cell produced by men and needed for reproduction

big

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US / bɪɡ /

UK / bɪɡ /

A1
  • adjecitve
  • Popular
  • Serious
  • Large

division

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US / dɪ'vɪʒn /

UK / dɪˈvɪʒən /

B1
  • noun
  • How many times a number is contained in another
  • One part of an organization
  • Act of dividing or separating into parts
  • Something that acts as a separating line or point

lottery

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US / 'lɒtərɪ /

UK / ˈlɑtəri /

B2
  • noun
  • Betting game of buying tickets to win money
  • Condition in which outcome is determined by luck
  • Selection system involving choosing numbers

gamete

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US / ˈgæmi:t /

UK / ˈɡæmˌit, ɡəˈmit /

C2
  • noun
  • Mature sexual reproductive cell

material

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US / məˈtɪəriəl /

UK / məˈtɪriəl /

A2
  • adjecitve
  • Relevant; (of evidence) important or significant
  • Belonging to the world of physical things
  • noun
  • Cloth; fabric
  • Supplies or data needed to do a certain thing
  • Substance from which a thing is made of

little

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US / 'lɪtl /

UK / ˈlɪtl /

A1
  • adjecitve
  • Being short in length of time
  • Not great in size, amount, or degree; small
  • Being very young or younger than others
  • adverb
  • By an amount or degree that is not very much
  • Not often; rarely
  • noun
  • A person's name

might

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US / maɪt /

UK / maɪt /

A1
  • other
  • Used to politely request an action
  • Used to express that something could happen
  • Power, strength, force or influence

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

theme

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US / θi:m /

UK / θim /

A2
  • noun
  • An main or dominant idea, motif
  • Main idea of a work of art, writing, or music
  • Main subject being discussed or described

wow

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US / waʊ /

UK / waʊ /

A1
  • exclamation
  • Sound people make when they make are impressed
  • verb
  • (Informal) to greatly impress someone

dance

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US / dɑ:ns /

UK / dæns /

A1
  • noun
  • A series of steps and movements in time to music
  • A social event with dancing while music is playing
  • verb
  • To move your body rhythmically to music

flavour

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US / ˈfleɪvə(r) /

UK / ˈflevɚ /

B1
  • noun
  • Taste of something, especially in food or drink
  • verb
  • To add extra taste to a food

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

neatly

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US / ni:tlɪ /

UK / ˈnitlɪ /

A2
  • adverb
  • With neatness

noticeable

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US / ˈnəʊtɪsəbl /

UK / ˈnoʊtɪsəbl /

B1
  • adjecitve
  • Being easy or likely to be sensed or noticed

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

pull

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US / pʊl /

UK / pʊl /

A1
  • noun
  • Act of breathing in smoke, as from a pipe
  • Force something has that draws other things to it
  • Using your hands to move something to you
  • verb
  • To breathe in smoke, as from a pipe
  • To hold something and move it toward you
  • To remove something by force

patreon

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US / 'peɪʃənts /

UK / 'peɪʃənts /

A1

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

one

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US / wʌn /

UK / wʌn /

A1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

fuse

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US / fju:z /

UK / fjuz /

B2
  • noun
  • Device connected to and making a bomb explode
  • Electrical safety device
  • verb
  • (Metal) to become one through heat contact

genetic

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US / dʒəˈnetɪk /

UK / dʒəˈnɛtɪk /

B1
  • adjecitve
  • Of, relating to, or controlled by genes

half

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US / hɑ:f /

UK / hæf, hɑf /

A1
  • adjecitve
  • Not complete
  • adverb
  • Partly; somewhat
  • noun
  • One of two equal periods of game time in a sport
  • The part you get when one is divided into two;

opposite

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US / ˈɔpəzit /

UK / ˈɑpəzɪt /

A2
  • adjecitve
  • Being totally different from
  • noun
  • Person, thing that is totally different to another
  • preposition
  • Across from or on the side facing something

level

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US / 'levl /

UK / ˈlɛvəl /

A2
  • adjecitve
  • (Sports) equal to another
  • Being steady and determined (e.g. a voice)
  • noun
  • Specific height of something
  • Amount of ability you have compared to others
  • Floor or deck within a building
  • Tool used to determine if something is lying flat
  • verb
  • To aim a gun at someone
  • To destroy a building; flatten an area completely
  • To make things flat or even
  • To make a score equal to another, in sports

plant

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US / plɑ:nt /

UK / plænt /

A2
  • noun
  • Factory or a place where things are made
  • Living thing with leaves and roots growing in soil
  • verb
  • To firmly position something (in the ground)
  • To put seeds, flowers, trees in the ground

parent

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US / 'peərənt /

UK / ˈpɛrənt, ˈpær- /

A1
  • noun
  • Person's, animal's mother or father
  • Something creating other things of the same kind

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

hey

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US / heɪ /

UK / he /

A1
  • exclamation
  • What you say when you want someone's attention

environment

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US / ɪn'vaɪrənmənt /

UK / ɛnˈvaɪrənmənt, -ˈvaɪən- /

A1
  • noun
  • Natural world in which plants and animals live
  • The entire surrounding conditions of something

neighbourhood

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US / ˈneɪbəhʊd /

UK / ˈneɪbərhʊd /

B1
  • noun
  • Area of a town or city that people live in

prepare

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US / prɪˈpeə(r) /

UK / prɪˈper /

A1
  • verb
  • To make something ready for use

real

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US / rɪəl /

UK / ˈriəl, ril /

A1
  • adjecitve
  • Actually existing or happening, not imagined
  • Being important or special

smoothly

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US / ˈsmu:ðli /

UK / smuðlɪ /

A2
  • adverb
  • In an evenly flowing manner or movement
  • In an easy manner, with no problems

sometimes

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US / ˈsʌmtaɪmz /

UK / ˈsʌmˌtaɪmz /

A1
  • adverb
  • Only at certain times; occasionally

buckle

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US / 'bʌkl /

UK / 'bʌkl /

B2
  • noun
  • Metal attachment or hook on the end of a belt
  • verb
  • To bend and lose strength when under pressure
  • To attach or close something with a buckle
  • To make bend or fall apart from heat or pressure
  • To give up, agree to do from being under pressure

friendly

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US / ˈfrendli /

UK / ˈfrɛndli /

A2
  • adjecitve
  • Acting like a friend; kind and helpful
  • noun
  • Game played not in a competition

join

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US / dʒɔɪn /

UK / dʒɔɪn /

A1
  • verb
  • To bring something close to another, to become one
  • To become a member of
  • To participate in an activity with others

professional

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US / prə'feʃənl /

UK / prəˈfɛʃənəl /

A2
  • adjecitve
  • Of jobs such as doctor, lawyer, accountant, etc.
  • Acting/done properly as a qualified person would
  • Getting paid for playing a sport/doing an activity
  • noun
  • Highly qualified person, e.g. lawyer or doctor
  • One who plays a sport or similar activity as a job

possibility

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US / ˌpɒsə'bɪlətɪ /

UK / ˌpɑsəˈbɪlɪti /

A2
  • noun
  • Something with a chance of happening or being true

put

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US / pʊt /

UK / pʊt /

A1
  • phrasal verb
  • to make a light stop shining by pressing or moving a switch
  • verb
  • To move or place a thing in a particular position
  • To rate something in importance or value
  • To write or say something in a certain manner

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

two

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US / tu: /

UK / tu /

A1
  • number
  • 2

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

biological

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US / ˌbaɪəˈlɒdʒɪkl /

UK / ˌbaɪəˈlɑdʒɪkəl /

B1
  • adjecitve
  • Being related to life and living things

hopefully

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US / ˈhəʊpfəli /

UK / ˈhopfəli /

A2
  • adverb
  • In a manner wishing something to happen

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

until

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US / ənˈtɪl /

UK / ʌnˈtɪl /

A1
  • conjunction
  • Up to; to a time when something happens
  • preposition
  • Before (a specific time)

vinegar

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US / ˈvɪnɪgə(r) /

UK / ˈvɪnɪɡɚ /

B1
  • noun
  • Sharp-tasting liquid made from sour wine, malt etc.

dad

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US / dæd /

UK / dæd /

A1
  • noun
  • Another word for father

forty

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US / 'fɔ:tɪ /

UK / ˈfɔrti /

A1
  • number
  • 40

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

slash

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US / slæʃ /

UK / slæʃ /

B2
  • noun
  • Line ( / ) used in writing
  • Long, deep cut, caused by a sharp object
  • verb
  • To cut violently with a sharp object
  • To decrease something by a large amount

version

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US / ˈvə:ʃən /

UK / ˈvɚʒən, -ʃən /

A2
  • noun
  • Different way that someone interprets something
  • New or different form of something
  • An updated form of some software

assortment

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US / əˈsɔ:tmənt /

UK / əˈsɔrtmənt /

B2
  • noun
  • Collection of different things some similarities

along

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US / əˈlɒŋ /

UK / əˈlɔ:ŋ /

A1
  • adverb
  • As a companion; taken with someone
  • preposition
  • At a point on a line

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

form

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US / fɔ:m /

UK / fɔrm /

A1
  • noun
  • Sports team or person's current winning record
  • Document you complete when making an application
  • Visible shape or style; type; kind
  • verb
  • To organize something such as a club or group
  • To develop; to come into a shape or substance
  • To make something into a particular shape

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

over

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US / 'əʊvə(r) /

UK / ˈovɚ /

A1
  • adverb
  • Finished; no longer happening
  • Towards the ground/away from a standing position
  • noun
  • A set of six consecutive balls bowled in cricket
  • other
  • Finished
  • preposition
  • Showing the relation when a thing is above another
  • On or covering something
  • Above or across something
  • More than you need
  • From one side to the other
  • In the direction of; toward

resource

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US / riˈsɔ:s /

UK / ˈriˌsɔrs, -ˌsors, -ˌzɔrs, -ˌzors, rɪˈsɔrs, -ˈsors, /

A2
  • noun
  • Something that can be used profitably; asset
  • An essential supply of something
  • Resourcefulness; ability to deal with problems
  • verb
  • To obtain (e.g. oil, gas) from its source

clone

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US / kləʊn /

UK / kloʊn /

B2
  • verb
  • To make an exact copy of a living thing

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

come

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US / kʌm /

UK / kʌm /

A1
  • verb
  • To arrive at a place
  • (Of mail) to be delivered
  • To move toward someone; go with someone
  • To reach a certain point or state

game

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US / ɡeɪm /

UK / ɡem /

A1
  • noun
  • Activity with rules that people play to have fun
  • Birds and animals people hunt to kill and eat
  • Match between two teams

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

genetically

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US / dʒə'netɪklɪ /

UK / dʒə'netɪklɪ /

B1
  • adverb
  • Caused or controlled, or by genes

match

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US / mætʃ /

UK / mætʃ /

A2
  • noun
  • Something that is equal to or the same as another
  • Small stick you strike to light a fire candle etc.
  • A sports competition between two people or teams
  • Person or thing that goes well with another
  • verb
  • To equal or be as good as something else
  • To work well or look good with something else

particular

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US / pəˈtɪkjələ(r) /

UK / pɚˈtɪkjəlɚ, pəˈtɪk- /

B2
  • adjecitve
  • One specific (one)
  • Having firm ideas about what is desirable
  • Being special or more than is typical

studio

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US / 'stju:dɪəʊ /

UK / ˈstudio, ˈstju- /

A2
  • noun
  • Place for painting, broadcasting, etc.

sour

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US / ˈsaʊə(r) /

UK / saʊr /

B2
  • adjecitve
  • Being mean and not friendly
  • Spoiled or made more acidic
  • Tasting like an acid
  • verb
  • (Of relationship) to cease to be good or friendly
  • To stop something being good or friendly
  • To spoil something or make something acidic

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

anaphase

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US / 'ænəˌfez /

UK / 'ænəˌfez /

A1
  • other
  • The stage of meiosis or mitosis when chromosomes move toward opposite ends of Nuclear spindle

chuck

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US / tʃʌk /

UK / tʃʌk /

B2
  • noun
  • Person's name
  • verb
  • To throw carelessly or casually

hang

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US / hæŋ /

UK / hæŋ /

A2
  • verb
  • To attach a picture, photograph etc. onto a wall
  • To float, move softly, or remain in the air
  • To kill by putting a rope around neck and dropping
  • To remain undecided, unsolved or unclear

drift

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US / drɪft /

UK / drɪft /

B1
  • verb
  • (Of sand, etc.) to be blown into heaps by the wind
  • (Of boats) to move without purpose on water
  • To move or live without a purpose or goal
  • To move slowly or effortlessly in water or air

merge

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US / mɜ:dʒ /

UK / mɜ:rdʒ /

B1
  • noun
  • Causing two or more things to combine into one
  • verb
  • To cause two or more things to combine into one
  • To be combined into one

kid

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US / kɪd /

UK / kɪd /

A2
  • adjecitve
  • Made from young goat skin
  • noun
  • Child or young person
  • Young goat
  • verb
  • To make fun of someone in a gentle way; to tease

meet

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US / mi:t /

UK / mit /

A1
  • noun
  • Sporting competition e.g. swimming
  • verb
  • To provide something that is necessary
  • To come together at a certain time or place

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

mostly

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US / ˈməʊstli /

UK / ˈmoʊstli /

A2
  • adverb
  • In large part; mainly or chiefly

reproduction

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US / ˌri:prəˈdʌkʃn /

UK / ˌriprəˈdʌkʃən /

B1
  • noun
  • Act or process of producing a copy of something
  • The process of making children

cross

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US / krɒs /

UK / krɔs, krɑs /

A2
  • adjecitve
  • Angry and upset
  • From one side of something to the other
  • noun
  • (Of animals) mixture of breeds in one animal
  • Person's name
  • verb
  • To put one thing over another e.g. arms
  • To breed one type of animal or plant with another
  • To not to agree with someone; oppose
  • To go from one side of something to the other
  • To meet at one point

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

double

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US / 'dʌbl /

UK / ˈdʌbəl /

A2
  • adjecitve
  • Concerning or intended for use by two people
  • Two times the amount or degree; twice
  • Made of two parts that are the same, similar
  • noun
  • Person that is exactly like someone else
  • verb
  • To be used for two functions at the same time
  • To make or become twice as much

leave

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US / li:v /

UK / liv /

A1
  • noun
  • Permission to do something
  • Vacation time; time off work
  • verb
  • To go away from; depart
  • To gift property to someone after you die
  • To allow something to continue happening
  • To let something remain unused or available
  • To let something or someone remain somewhere

nucleus

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US / ˈnju:kliəs /

UK / ˈnu:kliəs /

B2
  • noun
  • Center of an atom
  • Control center of a cell
  • Most important part of something larger

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

trait

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US / treɪt /

UK / tret /

C2
  • noun
  • A particular characteristic that can produce a particular type of behavior

trick

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US / trɪk /

UK / trɪk /

A2
  • adjecitve
  • Not reliable; likely to deceive you
  • noun
  • Act of trying to fool someone
  • Quick or skillful way of doing something
  • Something done to make someone laugh
  • verb
  • To fool someone in order to obtain a result
  • To playfully tease or fool to make someone laugh

either

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US / ˈaɪðə(r) /

UK / ˈiðɚ, ˈaɪðɚ /

A1
  • adjecitve
  • One of two (used when there is a choice of two)
  • adverb
  • (After negative statements) likewise, in addition
  • conjunction
  • Used as the first of two connected things
  • determiner
  • Used as the first of two connected things
  • pronoun
  • The one or the other

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

new

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US / nju: /

UK / nu, nju /

A1
  • adjecitve
  • Not old, recently born, built or made
  • Being or doing something for the first time
  • Not felt, seen or known previously
  • Having been recently bought or obtained

strategy

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US / 'strætədʒɪ /

UK / ˈstrætədʒi /

A2
  • noun
  • Careful plan or method for achieving a goal
  • other
  • Branch of military dealing with command

aimlessness

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US / ˈeɪmləsnəs /

UK / ˈeɪmləsnəs /

B2
  • noun
  • Without having a purpose or a goal

contain

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US / kənˈteɪn /

UK / kənˈten /

A2
  • verb
  • To keep something from spreading
  • To hold something inside something else

corner

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US / 'kɔ:nə(r) /

UK / ˈkɔrnɚ /

A2
  • noun
  • Place where two lines, sides, corners etc. meet
  • Edges of something, e.g. eyes, boxing ring
  • verb
  • To force into a position impossible to escape from
  • To go around a bend in the road (often by driving)

four

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US / fɔ:(r) /

UK / fɔr, for /

A1
  • number
  • 4

matter

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US / 'mætə(r) /

UK / ˈmætɚ /

A1
  • noun
  • Material all things are made of that fills space
  • Problem or reason for concern
  • verb
  • To be of great importance; to count

million

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US / ˈmɪljən /

UK / ˈmɪljən /

A1
  • number
  • 1,000,000

once

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US / wʌns /

UK / wʌns /

A1
  • adverb
  • One time; one instance
  • At a time in the past
  • conjunction
  • When; as soon as

while

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US / waɪl /

UK / hwaɪl, waɪl /

A1
  • conjunction
  • In spite of the fact that; although
  • During the time that; at the same time
  • noun
  • Short amount of time

wait

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US / weɪt /

UK / wet /

A1
  • verb
  • To delay or not do something until later
  • To spend time until an expected thing happens
  • To remain in a place until a thing happens

trade

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US / treɪd /

UK / treid /

A2
  • noun
  • A specific industry, e.g. shoe making
  • Action of buying and selling things in business
  • The buying and selling of goods and services
  • Exchanging something for something else
  • Job often requiring physical skills, e.g. plumbing
  • verb
  • To buy, sell and exchange goods in business
  • To give something in return for something else

associate

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US / ə'səʊʃɪeɪt /

UK / əˈsoʊʃiˌeɪt /

B1
  • adjecitve
  • Part of a job title indicating a junior position
  • noun
  • Partner in professional work, e.g. in law
  • verb
  • To spend time with other people; mix with
  • To form a connection in your mind between things

combine

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US / kəmˈbaɪn /

UK / kəmˈbaɪn /

A2
  • verb
  • To mix several things together to form one thing

develop

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US / dɪ'veləp /

UK / dɪˈvɛləp /

A1
  • verb
  • To explain something in steps and in detail
  • To create or think of something
  • To grow bigger, more complex, or more advanced
  • To make a photograph from film

fungal

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US / ˈfʌŋgl /

UK / ˈfʌŋɡəl /

B2
  • adjecitve
  • Concerning fungi

gene

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US / dʒi:n /

UK / dʒin /

B1
  • noun
  • Part of cell controlling development of a thing

dramatically

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US / drə'mætɪklɪ /

UK / drəˈmætɪkl:ɪ /

B1
  • adverb
  • In a sudden or extreme manner

point

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US / pɔɪnt /

UK / pɔɪnt /

A1
  • noun
  • An item to be discussed
  • Small spot or dot
  • Fact or detail
  • Feature of something
  • The size of the text on a page or screen
  • A certain time or stage in a process
  • Certain position in time or space
  • Idea or fact you try to convince people about
  • Measurement of scores in a game, sport
  • Sharp end of something, e.g. a pen or pin
  • verb
  • To face a certain direction, e.g. north
  • To indicate something with your finger to others

mitosis

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US / maɪˈtəʊsɪs /

UK / maɪˈtoʊsɪs /

A1
  • noun
  • Cell division in which the nucleus divides into nuclei containing the same number of chromosomes

viable

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US / ˈvaɪəbl /

UK / ˈvaɪəbəl /

B1
  • adjecitve
  • Being capable of living, growing, and developing

third

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US / θɜ:d /

UK / θɜ:rd /

A1
  • adjecitve
  • 3rd: Number after second

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

folk

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US / fəʊk /

UK / fok /

A2
  • adjecitve
  • (Of ordinary people) not sophisticated
  • noun
  • Ordinary common people

ensure

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US / ɪn'ʃʊə(r) /

UK / ɛnˈʃʊr /

A2
  • verb
  • To make something sure, certain, or safe

sell

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US / sel /

UK / sɛl /

A1
  • verb
  • To exchange something for money
  • To persuade people to do, like or agree

spindle

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US / ˈspɪndl /

UK / ˈspɪndl: /

C1
  • noun
  • Part of a tool used to wind thread or wool

widely

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US / ˈwaɪdli /

UK / ˈwaɪdlɪ /

A1
  • adverb
  • To a large degree; over a large range
  • By or among a large number of people

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

additional

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US / əˈdɪʃənl /

UK / ə'dɪʃənl /

A2
  • adjecitve
  • Further or added

allele

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US / əˈli:l /

UK / əˈlil /

A1
  • noun
  • Either of a pair (or series)

exactly

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US / ɪgˈzæktli /

UK / ɪɡˈzæktli /

A1
  • adverb
  • No more and no less than; precisely

fail

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US / feɪl /

UK / fel /

A1
  • noun
  • A mark on a test showing you did not pass
  • verb
  • To be unsuccessful in passing a class or exam
  • To not do or provide something that is needed
  • To stop working or functioning; to break down
  • To not achieve a goal, or to go wrong

gambit

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US / ˈɡæmbɪt /

UK / ˈɡæmbɪt /

C1
  • noun
  • Action made to produce a future advantage

massive

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US / ˈmæsɪv /

UK / ˈmæsɪv /

B1
  • adjecitve
  • Very big; large; too big

series

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US / ˈsɪəri:z /

UK / ˈsɪriz /

A1
  • noun
  • Set of stories or articles on a particular subject
  • other
  • Number of things that happen one after another

shift

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US / ʃɪft /

UK / ʃɪft /

A2
  • adjecitve
  • (Of work) starting at a certain time, as at night
  • noun
  • A change in a persons plans, opinions or beliefs
  • Period of work starting at a certain time
  • verb
  • To change in position or direction
  • To move something from one place to another

testes

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US / ˈtestiːz /

UK / ˈtestiːz /

A1
  • other
  • Male sex organs below the penis

syndrome

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US / 'sɪndrəʊm /

UK / ˈsɪnˌdrom /

B1
  • noun
  • A group of signs and symptoms of a disease

homologous

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US / həˈmɒləgəs /

UK / həˈmɑləɡəs, ho- /

A1
  • adjecitve
  • Similar, but with different function

importantly

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US / ɪmˈpɔːtntli /

UK / ɪmˈpɔːrtntli /

A2
  • adverb
  • In an important way;

carbon

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US / 'kɑ:bən /

UK / ˈkɑrbən /

B1
  • noun
  • Chemical element with an atomic number of 6

gonad

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US / ˈgəʊnæd /

UK / ˈɡoˌnæd /

A1
  • noun
  • Gland in which gametes (sex cells) are produced

normal

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US / 'nɔ:ml /

UK / ˈnɔrməl /

A1
  • adjecitve
  • Standard or regular way of doing something
  • Having standard mental or physical ability, health

reproductive

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US / ˌri:prəˈdʌktɪv /

UK / ˌriprəˈdʌktɪv /

B1
  • adjecitve
  • Concerning the process of making children
  • Relating to having children, young, or new plants

randomize

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US / ˈrændəmaɪz /

UK / ˈrændəmaɪz /

B2
  • verb
  • To arrange in a random order

reason

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US / 'ri:zn /

UK / ˈrizən /

A1
  • noun
  • Ability to think about facts and form a judgment
  • Explanation for why something occurred or was done
  • verb
  • To think and make conclusions in a logical manner

side

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US / saɪd /

UK / saɪd /

A1
  • adjecitve
  • In addition to the central or most important thing
  • Next to, or very close to, the right or left of
  • noun
  • Position or opinion that is opposite to another
  • Right or left part of a person's body
  • Feature of someone's personality
  • Straight edge of an object
  • One of two or more groups fighting each other
  • verb
  • To decide to agree with one point, not the other

totally

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US / ˈtəʊtəli /

UK / ˈtotl:ɪ /

A1
  • adverb
  • In a complete way; completely; absolutely

usual

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US / ˈju:ʒuəl /

UK / ˈjuʒuəl /

A1
  • adjecitve
  • Being the way things occur most of the time

somehow

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US / ˈsʌmhaʊ /

UK / ˈsʌmˌhaʊ /

A1
  • adverb
  • In a way that is not known or certain

gammy

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US / ˈɡæmi /

UK / ˈɡæmi /

A1
  • adjecitve
  • (Of horses) sore or lame

pokemon

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US / pəʊ'kemən /

UK / poʊ'kemən /

A1
  • noun
  • A series of Japanese video games and related media such as trading cards and television programs, fe

separate

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US / 'sepəreɪt /

UK / 'sepəreɪt /

A2
  • adjecitve
  • Being different from or unrelated to another
  • verb
  • To divide two things by being in between them
  • To live away from your husband or wife
  • To move things away from each other

shiny

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US / ˈʃaɪni /

UK / ˈʃaɪni /

A2
  • adjecitve
  • Reflecting a lot of light; bright and smooth
  • Bright because of producing light

taste

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US / teɪst /

UK / test /

A2
  • noun
  • (Good) sense of style in clothes, art, or manners
  • Flavor in your mouth from food or drink
  • A liking for something; preference
  • Brief experience of something
  • verb
  • To experience something
  • To experience the flavor of food, drink
  • To briefly experience to see if you like something

visit

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US / ˈvɪzɪt /

UK / ˈvɪzɪt /

A1
  • noun
  • Trip to a place for a time, usually for a reason
  • verb
  • To go to a place for a time, usually for a reason

true

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US / tru: /

UK / tru: /

A1
  • adjecitve
  • Agreeing with the facts; not false; real or actual

taco

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US / ˈtækəʊ /

UK / ˈtɑ:koʊ /

B2
  • noun
  • Tortilla rolled cupped around a filling

after

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US / 'ɑ:ftə(r) /

UK / ˈæftɚ /

A1
  • adverb
  • Later than another time, or behind something
  • conjunction
  • Following something before
  • preposition
  • When an event happened or time has passed

already

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US / ɔ:lˈredi /

UK / ɔlˈrɛdi /

A1
  • adverb
  • Having happened or been done before this time

describe

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US / dɪ'skraɪb /

UK / dɪˈskraɪb /

A1
  • verb
  • To tell the appearance, sound, smell of something

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

episode

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US / 'epɪsəʊd /

UK / ˈɛpɪˌsod /

B1
  • noun
  • One separate event in a series of events
  • Show which is part of a larger story

relate

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US / rɪ'leɪt /

UK / rɪˈlet /

A2
  • verb
  • To demonstrate a logical relationship between
  • To understand or sympathize with, e.g. a problem
  • To tell a story, or tell about a particular event

shoe

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US / ʃu: /

UK / ʃu /

A2
  • noun
  • Outer covering for the foot, often made of leather
  • Piece of metal nailed under a horse's foot
  • verb
  • To put a metal ring on a horse's foot

wild

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US / waɪld /

UK / waɪld /

A2
  • adjecitve
  • Living in nature; not tame
  • (Of land) not developed by people
  • adverb
  • In a manner which lacks control
  • noun
  • A natural environment e.g. jungle, forest

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

everybody

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US / ˈevribɒdi /

UK / ˈɛvriˌbɑdi, -ˌbʌdi /

A1
  • pronoun
  • Every person; everyone

express

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US / ɪk'spres /

UK / ɪkˈsprɛs /

A1
  • adjecitve
  • Sent by a fast mail service
  • Traveling at high speed
  • noun
  • Fast train or bus
  • verb
  • To send something by fast mail
  • To state or show what you think or how you feel

package

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US / ˈpækɪdʒ /

UK / ˈpækɪdʒ /

A1
  • adjecitve
  • Presented as one item but includes several
  • noun
  • Box or container items are placed in for mailing
  • A container for items for sale, e.g. food
  • Group of several items or services offered as one
  • verb
  • To present or sell a group of things as one item
  • To put something into a container to store it

set

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US / set /

UK / sɛt /

A1
  • adjecitve
  • Prepared for something; ready
  • noun
  • Complete group of something
  • Place where a television show or movie is filmed
  • Group of games in a tennis match
  • Device that receives radio or television signals
  • verb
  • To make a clock state or ring at a particular time
  • To decide upon or choose something
  • To make something ready for use (e.g. table)
  • To decide on a price for something
  • To become hard (of glue, concrete etc.)
  • To be located in a specific place or time
  • To put (e.g. a vase) down carefully in a place
  • To put someone in a certain condition or state
  • (Of the sun) to go lower than the horizon

shortage

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US / ˈʃɔ:tɪdʒ /

UK / ˈʃɔ:rtɪdʒ /

A2
  • noun
  • A lack of something necessary

seal

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US / si:l /

UK / sil /

B1
  • noun
  • Large fish-eating animal that lives on sea or land
  • Official mark made in hot wax to close a document
  • Piece of rubber used to keep water, dirt out
  • verb
  • To close tightly to protect it from leaking
  • To close an envelop or package
  • To cover a surface with a substance to protect it

unique

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US / jʊ'ni:k /

UK / juˈnik /

A2
  • adjecitve
  • Unlike other things; being the only one like it

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

yourself

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US / jɔ:ˈself /

UK / jʊrˈsɛlf, jɔr-, jor-, jə- /

A1
  • pronoun
  • Reflexive form of 'you', used for an emphasis

test

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US / test /

UK / test /

A1
  • noun
  • A medical examination
  • Action to establish the truth or nature of
  • Examination; questions to measure knowledge
  • verb
  • To be given a medical examination
  • To try to establish the truth or nature of
  • To ask a series of questions to measure knowledge

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

disjunction

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US / dɪsˈdʒʌŋkʃn /

UK / dɪsˈdʒʌŋkʃən /

C2
  • noun
  • Something that gives two different alternatives

generation

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US / ˌdʒenəˈreɪʃn /

UK / ˌdʒɛnəˈreʃən /

A2
  • noun
  • Act or process of producing or causing something
  • People born and living at about the same time

fan

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US / fæn /

UK / fæn /

A2
  • noun
  • Thing you wave in front of your face to stay cool
  • Someone who admires a famous person, sport etc.
  • verb
  • To blow air upon a fire to make it stronger
  • To use a device to cool yourself, something

eighty

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US / 'eɪtɪ /

UK / ˈeti /

A1
  • number
  • 80

math

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US / mæθ /

UK / mæθ /

A2
  • noun
  • Study or science of numbers and shapes

pop

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US / pɒp /

UK / pɑp /

B2
  • adjecitve
  • Type of music or art popular with many people
  • noun
  • Sweet soda drink
  • verb
  • To cause something to open or burst suddenly
  • To go to or in a place for a brief period of time

occur

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US / əˈkɜ:(r) /

UK / əˈkɚ /

A2
  • verb
  • To come to pass or to happen

randomness

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US / 'rændəmnəs /

UK / 'rændəmnəs /

B1
  • noun
  • Degree of being without pattern, intent or order

stuff

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US / stʌf /

UK / stʌf /

A1
  • noun
  • Generic description for things, materials, objects
  • verb
  • To push material inside something, with force

split

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US / splɪt /

UK / splɪt /

A2
  • adjecitve
  • No longer married or in a relationship
  • (Injured) by cutting it open, as in someone's lip
  • (Of a decision) when people cannot decide a winner
  • noun
  • Difference of opinion in a group causing a break
  • Separation or a break in something
  • verb
  • To become divided or broken along a straight line
  • To cause a cut in (lip, etc.)
  • To have difference of opinion in a group
  • To separate into two or more pieces
  • To divide something in an even or fair way

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

though

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US / ðəu /

UK / ðo /

A1
  • adverb
  • Although, despite the fact that

classmate

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US / ˈklɑ:smeɪt /

UK / ˈklæsˌmet /

A2
  • noun
  • Someone studying in your class with you

combination

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US / ˌkɒmbɪ'neɪʃn /

UK / ˌkɑmbəˈneʃən /

B1
  • noun
  • Series of letters or numbers needed to open a lock
  • Act or result of mixing things together

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

individual

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US / ˌɪndɪˈvɪdʒuəl /

UK / ˌɪndəˈvɪdʒuəl /

A2
  • adjecitve
  • Made for use by one single person
  • Having a distinct manner different from others
  • noun
  • Single person, looked at separately from others

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

music

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US / 'mju:zɪk /

UK / ˈmjuzɪk /

A1
  • noun
  • Sounds that are sung or played to give pleasure
  • Academic study of rhythms and sounds
  • Written symbols that represent musical sounds

never

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US / 'nevə(r) /

UK / ˈnɛvɚ /

A1
  • adverb
  • Not ever; not at any time

debonair

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US / dɛbəˋnɛr /

UK / dɛbəˋnɛr /

C2
  • adjecitve
  • Friendly, charming, and fashionably dressed

ruffle

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US / ˈrʌfl /

UK / ˈrʌfəl /

B2
  • noun
  • A trimming of frilled fabric e.g. on a collar
  • verb
  • To disturb the smoothness of e.g. water
  • To upset the balance or status quo

special

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US / 'speʃl /

UK / ˈspɛʃəl /

A1
  • adjecitve
  • Being additional or extra
  • Different, better or greater than normal
  • noun
  • Heavily discounted sales item

compound

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US / 'kɒmpaʊnd /

UK / kɑmˈpaUnd /

B1
  • adjecitve
  • (Of a term) created by combining two or more words
  • noun
  • Series of buildings that are walled or fenced off
  • Chemical made up of several others
  • Closed walled area, as in a prison
  • Something formed by combining elements/parts
  • Term created by using two or more words together
  • verb
  • To pay interest on a loan including the interest
  • To make something from various parts or components
  • To make a mistake or problem worse

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

sexual

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US / ˈsekʃuəl /

UK / ˈsɛkʃuəl /

A2
  • adjecitve
  • Relating to men and women and their relationships
  • Of the physical activity that can produce babies

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

banking

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US / ˈbæŋkɪŋ /

UK / ˈbæŋkɪŋ /

A2
  • noun
  • Act of keeping your money in a bank
  • verb
  • To put or keep your money in a bank
  • To turn a plane when flying; (of a plane) to turn

cool

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US / ku:l /

UK / kul /

A1
  • adjecitve
  • Steady and calm when facing difficulties
  • Almost cold; not warm or hot
  • Smart or stylish in a way (young) people admire
  • Unfriendly in an indirect way; distant
  • verb
  • To make something decrease in temperature
  • (Of an emotion, etc.) to become less strongly felt

begin

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US / bɪ'ɡɪn /

UK / ˈbeɡɪn /

A1
  • verb
  • To do the first part of an action; to start

eight

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US / eɪt /

UK / et /

A1
  • number
  • 8

chromosome

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US / ˈkrəʊməsəʊm /

UK / ˈkroʊməsoʊm /

C2
  • noun
  • Cell structures that carry the genetic material

pair

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US / peə(r) /

UK / per /

A2
  • noun
  • Two of the same thing, e.g. socks
  • Two people viewed together for some reason; couple
  • verb
  • To put two things or people together

sound

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US / saʊnd /

UK / saʊnd /

A1
  • adjecitve
  • Sensible, dependable and reliable
  • Unbroken or undisturbed, as of sleep
  • Firm or solid in structure
  • Sane; not mentally ill
  • Clearly reasoned; involving sense, good judgment
  • noun
  • Unique quality that characterizes a style of music
  • Waves traveling in air or water that can be heard
  • verb
  • To seem or appear to be, from what was said
  • To say in a clear deliberate manner
  • To make a noise, e.g. to ring a bell

animal

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US / ˈænɪml /

UK / ˈænəməl /

A1
  • noun
  • A living creature that is not a plant or person

coli

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US / 'kəʊlaɪ /

UK / 'koʊlaɪ /

A1
  • noun
  • Type of bacterium

cycle

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US / ˈsaɪkl /

UK / ˈsaɪkəl /

A2
  • noun
  • Series of regular and repeated actions
  • Bicycle, bike
  • verb
  • To go through a series of events repeatedly
  • To ride on a bicycle

exchange

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US / ɪksˈtʃeɪndʒ /

UK / ɪksˈtʃendʒ /

A2
  • noun
  • Sharing/directing a look, etc. at someone else
  • Short discussion or talk
  • The place you can change money to another currency
  • Place where things or services are exchanged
  • Act of returning something to a store
  • Act of giving a thing in return for another thing
  • verb
  • To share (a look, a few words etc.)
  • To sell one currency to get another
  • To return something to a store
  • To give things of similar value to each other

jelly

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US / ˈdʒeli /

UK / ˈdʒɛli /

B2
  • adjecitve
  • Being soft and without form
  • noun
  • Semisolid food substance, eaten as dessert
  • Sweet food made from fruit and spread on bread

indiana

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US / ˈindiˈænə /

UK / ˌɪndiˈænə /

A1
  • noun
  • A state in midwestern United States

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

duck

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US / dʌk /

UK / dʌk /

B1
  • noun
  • Common type of water bird
  • someone's face when their lips are pushed outwards, especially in photographs
  • verb
  • To avoid doing something that is difficult
  • To lower your head to avoid hitting something

line

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US / laɪn /

UK / laɪn /

A1
  • noun
  • Border that divides two places or regions
  • Long crease in the skin, often from age
  • Mark that is long, straight and very thin
  • Row of words, letters or numbers that are written
  • Telephone connection
  • People waiting one behind the other; queue
  • Long thin wire, e.g. for electrical signal
  • verb
  • To put material along the inside of something

cluster

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US / 'klʌstə(r) /

UK / ˈklʌstɚ /

B1
  • noun
  • A small group of things
  • verb
  • To come together in a group, flock etc.

chef

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US / ʃef /

UK / ʃɛf /

B1
  • noun
  • Person whose job is to cook food in a restaurant
  • The top assistant in a professional kitchen

depend

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US / dɪˈpend /

UK / dɪˈpend /

B1
  • verb
  • Be controlled or determined by (someone/something)

wrap

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US / ræp /

UK / ræp /

B1
  • noun
  • Piece of clothing worn loosely on the shoulders
  • Thin bread filled with food and rolled
  • verb
  • To be or move around something
  • To cover something with paper or a cloth e.g. gift

trisomy

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US / ˈtraɪsəʊmi /

UK / traɪˈsomi; ˈtraɪˌsomi /

A1
  • other
  • Chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell

arrangement

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US / əˈreɪndʒmənt /

UK / əˈrendʒmənt /

A2
  • noun
  • Particular design of a device
  • Piece of music written for a particular instrument
  • Group of things organized in a particular way
  • Organized plan, event for a time and place
  • Action done in order for something to happen

egg

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US / eg /

UK / ɛɡ /

A2
  • noun
  • Hard-shelled thing from which a young bird is born

fuego

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US / ˈfweɪɡəʊ /

UK / ˈfweɪɡoʊ /

A1
  • other
  • A volcano in south central Guatemala

dna

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US / ˌdiː en ˈeɪ /

UK / ˌdiː en ˈeɪ /

B2
  • noun
  • Chemical in living cells with genetic information

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

force

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US / fɔ:s /

UK / fɔrs, fors /

A1
  • noun
  • Group of persons trained for military action; army
  • Pressure; attraction
  • The use of physical strength/violence to persuade
  • verb
  • To use physical strength or violence to persuade

during

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US / ˈdjʊərɪŋ /

UK / ˈdʊrɪŋ, ˈdjʊr- /

A1
  • preposition
  • At some point in the course of an event or thing

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

step

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US / step /

UK / stɛp /

A1
  • noun
  • Movement done as part of a particular dance
  • Distance covered by one movement of a leg; stride
  • One part or stage in a process
  • Sound made by the feet while walking; footstep
  • Flat horizontal piece that forms stairs
  • verb
  • To raise and moving the foot to put it down

cell

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US / sel /

UK / sɛl /

A2
  • noun
  • Smallest unit of living things in biology
  • Group of people - often from a secret organization
  • Prisoner's room in a jail
  • Shortened form of 'cellphone'

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

diversity

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US / daɪ'vɜ:sətɪ /

UK / dɪˈvə:sɪti, daɪ- /

B1
  • noun
  • Having a range of different races, ideas etc.

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

each

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US / i:tʃ /

UK / itʃ /

A1
  • determiner
  • Every one of two or more things
  • pronoun
  • Per one person or thing

twice

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US / twaɪs /

UK / twaɪs /

A1
  • adverb
  • Two times

typical

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US / ˈtɪpɪkl /

UK / ˈtɪpɪkəl /

A2
  • adjecitve
  • Normal; usual; expected

cause

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US / kɔ:z /

UK / kɔz /

A2
  • noun
  • Belief, goal or organization that people support
  • Reason for
  • verb
  • To make something happen; create effect or result

diploid

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US / ˈdɪplɔɪd /

UK / ˈdɪpˌlɔɪd /

A1
  • noun
  • Organism or cell having the normal amount of DNper cell; ie, two sets of chromosomes or twice the ha

place

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US / pleɪs /

UK / ples /

A1
  • noun
  • Particular location, area or region
  • verb
  • To put someone in a particular type of situation
  • To put something in a certain location or position

own

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US / əʊn /

UK / on /

A1
  • adjecitve
  • Belong to oneself
  • determiner
  • Yours, his, hers, etc.; not belonging to another
  • pronoun
  • (Something) belong to myself
  • verb
  • To have something as your property

phase

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US / feɪz /

UK / fez /

A2
  • noun
  • Different stages of the moon from new to full
  • Distinct part or step in a process
  • One stage of a process or series of stages
  • verb
  • To make happen in a gradual ordered way

similar

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US / ˈsɪmələ(r) /

UK / ˈsɪməlɚ /

A1
  • adjecitve
  • Nearly the same; alike

starter

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US / ˈstɑ:tə(r) /

UK / ˈstɑ:rtə(r) /

A2
  • noun
  • Electric motor for starting an engine
  • First part of a big meal, e.g. soup or salad

case

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US / keɪs /

UK / kes /

A1
  • noun
  • Container used to carry things, e.g. clothes
  • Set of facts about a crime
  • Set of facts about an event
  • Example or instance of something
  • verb
  • To find out about a place, as in planning to steal

factory

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US / ˈfæktri /

UK / ˈfæktəri /

A2
  • noun
  • Building where things are made

enough

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US / ɪˈnʌf /

UK / ɪˈnʌf /

A1
  • adjecitve
  • Sufficient to answer the need
  • adverb
  • To a satisfactory degree
  • pronoun
  • Equal to what is needed; as much as required
  • Adequate number or amount

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

mix

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US / mɪks /

UK / mɪks /

A2
  • noun
  • A combination of more than two things
  • verb
  • To combine two or more things to make one
  • To meet and get along with others, e.g. at a party

type

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US / taɪp /

UK / taɪp /

A1
  • noun
  • Printed letters or blocks used for printing them
  • Group of things or people sharing common features
  • verb
  • To identify something belonging to a group
  • To write by touching keys on a keyboard

tend

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US / tend /

UK / tɛnd /

A2
  • verb
  • To move or act in a certain manner
  • To take care of
  • To regularly behave in a certain way

suddenly

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US / ˈsʌdənli /

UK / ˈsʌdn:lɪ /

A1
  • adverb
  • In an unexpected or very quick manner

variation

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US / ˌveəriˈeɪʃn /

UK / ˌvɛriˈeʃən, ˈvær- /

A2
  • noun
  • Something almost the same as another but different
  • Music played with a different tune from another

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

sustain

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US / sə'steɪn /

UK / səˈsten /

B2
  • verb
  • To lengthen or continue to do something
  • To support or maintain someone or something
  • To suffer something damaging or bad

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

eventually

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US / ɪˈventʃuəli /

UK / ɪˈvɛntʃuəli /

A2
  • adverb
  • After a long time; after many attempts; in the end

independent

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US / ˌɪndɪˈpendənt /

UK / ˌɪndɪˈpɛndənt /

A2
  • adjecitve
  • Making your own decisions; acting by yourself
  • noun
  • A person not connected to a political party

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

prophase

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US / ˈprəʊˌfeɪz /

UK / ˈproʊˌfeɪz /

A1
  • other
  • First stage of meiosis
  • First stage of mitosis

people

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US / 'pi:pl /

UK / ˈpipəl /

A1
  • noun
  • Persons sharing culture, country, background, etc.
  • Men, Women, Children

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

bundle

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US / ˈbʌndl /

UK / ˈbʌndl /

B1
  • noun
  • A group of things that are tied/fastened together
  • A set of products sold together cheaply
  • verb
  • To fasten, tie or wrap several things together
  • To sell a set of products at a lower price
  • To quickly send/take someone away

first

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US / fɜ:st /

UK / fɚst /

A1
  • adjecitve
  • 1st; Coming before all others in time or place
  • noun
  • Something that has not happened before
  • Position of the winner of a competition

hypothetically

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US / ˌhaɪpə'θetɪklɪ /

UK / ˌhaɪpə'θetɪklɪ /

B2
  • adverb
  • In a hypothetical way; as an example

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

roughly

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US / ˈrʌfli /

UK / ˈrʌflɪ /

B1
  • adverb
  • Approximately; (of numbers) about; around
  • In a manner that is violent or not careful
  • In an inexact, imprecise or violent way
  • In a basic, simple manner

baby

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US / ˈbeɪbi /

UK / ˈbeɪbi /

A2
  • adjecitve
  • Small in size; smaller than usual
  • noun
  • A very young child, who cannot yet speak
  • verb
  • To treat someone as if they were newly born

dig

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US / dɪg /

UK / dɪɡ /

A2
  • verb
  • To move material to create a hole

essentially

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US / ɪˈsenʃəli /

UK / ɪˈsenʃəli /

A2
  • adverb
  • Basically; (said when stating the basic facts)

least

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US / li:st /

UK / list /

A1
  • adverb
  • In the smallest or lowest way
  • noun
  • Something that is of the lowest or smallest degree

ride

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US / raɪd /

UK / raɪd /

A1
  • noun
  • Machine at an amusement park for riding on for fun
  • Trip on a bicycle or a horse
  • verb
  • To travel in a particular vehicle as a passenger
  • To sit on and control a horse or vehicle

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

bunch

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US / bʌntʃ /

UK / bʌntʃ /

B1
  • noun
  • A group of things of the same kind
  • verb
  • To group people or things closely together
  • (Cloth) to gather/be gathered together in folds

hit

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US / hɪt /

UK / hɪt /

A1
  • noun
  • A planned killing, usually for money
  • Song, movie etc. that is successful
  • When someone strikes someone or something
  • Time when a player makes contact with the ball
  • Time when a website is accessed
  • verb
  • To have a negative impact on a person/place/thing
  • To press something, such as a button or switch
  • To suddenly realize the importance of something
  • To move your hand, a bat, etc. against with force
  • To fight, attack or damage something or someone
  • To arrive at a specific place, level, or goal
  • To make contact with the ball in a game or sport

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

tell

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US / tel /

UK / tɛl /

A1
  • verb
  • To (strongly) advise a person to do something
  • To be able to guess
  • To say or communicate information to someone
  • To inform, but without speaking; indicate
  • To have a negative effect on someone
  • To order someone to do something; command
  • To recognize something based on certain signs
  • To report something to an authority
  • To explain something or teach someone something

smile

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US / smaɪl /

UK / smaɪl /

A1
  • noun
  • Raising the corners of the mouth showing happiness
  • verb
  • To put up the corners of mouth to show happiness

specie

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US / 'spi:ʃi: /

UK / 'spi:ʃɪ /

B1
  • noun
  • Singular of species

wardrobe

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US / ˈwɔ:drəʊb /

UK / ˈwɔ:rdroʊb /

B1
  • noun
  • Stock of clothes belonging to a person

stay

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US / steɪ /

UK / ste /

A1
  • noun
  • Legal order to stop or delay an action
  • Strong rope or wire that supports a ship's mast
  • Period of time spent living in or visiting a place
  • verb
  • To keep trying without giving up
  • To remain in the same place and not move away
  • To spend time visiting a place or someone's home

cover

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US / 'kʌvə(r) /

UK / ˈkʌvɚ /

A1
  • noun
  • A different version of another song
  • Bed sheets; blankets
  • (Police or military) protection from attack
  • Amount of money to be paid in an insurance claim
  • Thing you put over something to close or hide it
  • Front and back part of a book or magazine
  • Shelter built to protect from the natural elements
  • verb
  • To record a different version of another song
  • To include as part of its area
  • To put something over something to hide it
  • To discuss a subject in a talk or meeting
  • To form a layer over something so it is hidden
  • To have sufficient funds to pay for something
  • To include something within an agreed limit
  • To report news on TV, radio or in a newspaper
  • (Police or military) to protect from attack
  • To travel a certain distance in a given time
  • To wrap something with something, such as a cloth

extra

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US / 'ekstrə /

UK / 'ekstrə /

A2
  • adjecitve
  • More than necessary; additional
  • noun
  • Items more than you need; additional items
  • Person who has a small part in a movie
  • Special version of a newspaper

identical

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US / aɪˈdentɪkl /

UK / aɪˈdɛntɪkəl /

B1
  • adjecitve
  • The same in every way

information

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US / ˌɪnfəˈmeɪʃn /

UK / ˌɪnfɚˈmeʃən /

A1
  • noun
  • Collection of facts and details about something

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

part

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US / pɑ:t /

UK / pɑ:rt /

A1
  • adjecitve
  • To some degree; half; not fully
  • noun
  • Division of a book
  • Ratio of something, e.g. 3 of gin, 1 of tonic
  • A line in a person's hair, made with a comb
  • Character an actor plays on stage, movie, or TV
  • Some, but not all of a specific thing
  • Role in causing something to happen
  • verb
  • To make a line in a person's hair, by using a comb
  • To move two things apart creating a space
  • To leave someone, or to break off a relationship

recombination

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US / ri:'kɒmbə'neɪʃən /

UK / ri:'kɒmbə'neɪʃən /

A1
  • noun
  • Combining of items different from their parents

salt

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US / sɔ:lt /

UK / sɔlt /

A2
  • adjecitve
  • Being preserved or seasoned with salt
  • noun
  • Natural white crystal used to flavor food
  • verb
  • To add salt to food in order to improve its taste
  • To add salt to ice in order to melt it
  • To preserve food by adding salt

six

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US / sɪks /

UK / sɪks /

A1
  • number
  • 6

sixty

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US / 'sɪkstɪ /

UK / ˈsɪksti /

A1
  • number
  • 60

without

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US / wɪˈðaʊt /

UK / wɪðˈaʊt, wɪθ- /

A1
  • preposition
  • Not with; not having

count

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US / kaʊnt /

UK / kaʊnt /

A2
  • noun
  • Number of things added together, e.g. votes
  • With the number of crimes, knockouts, as stated
  • verb
  • To add things together to find the total number
  • To matter or be important
  • To include someone or something in a final number

center

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US / 'sentə /

UK / ˈsɛntɚ /

A1
  • noun
  • Community place people go health or social reasons
  • Place in the middle of something
  • Person or thing that is attracting attention
  • verb
  • To direct focus toward something

end

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US / end /

UK / ɛnd /

A1
  • noun
  • The point where a process or activity stops
  • A point that marks the limit of something; finish
  • Goal or desired result
  • The tip, edge or limit of something
  • verb
  • To be the last part of something

remember

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US / rɪ'membə(r) /

UK / rɪˈmɛmbɚ /

A1
  • verb
  • To give someone a gift, e.g. birthday, wedding
  • To hold a thought in your mind to not forget it
  • To bring a previous image or idea to your mind

tug

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US / tʌg /

UK / tʌɡ /

B1
  • noun
  • Pull at something that is hard or sudden
  • verb
  • To pull (something) hard or suddenly

evil

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US / 'i:vl /

UK / ˈivəl /

A2
  • adjecitve
  • Morally bad; causing harm to people
  • noun
  • Act considered morally bad
  • Value, condition, or conduct that causes suffering

fibre

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US / ˈfaɪbə(r) /

UK / ˈfaɪbɚ /

C2
  • noun
  • Thin natural thread that can be used to make yarn

instance

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US / 'ɪnstəns /

UK / ˈɪnstəns /

A2
  • noun
  • An example of something; case
  • verb
  • To give as an example of something else

plate

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US / pleɪt /

UK / plet /

A2
  • noun
  • Flat dish used for eating or serving food
  • Smooth, thin piece of metal applied in a layer
  • Small, flat piece of metal with information on it
  • verb
  • To put a layer of metal on something to protect it

process

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US / prə'ses /

UK / ˈprɑsˌɛs, ˈproˌsɛs /

A2
  • noun
  • Dealing with official forms in the way required
  • Set of changes that occur slowly and naturally
  • verb
  • To organize and use data in a computer
  • To deal with official forms in the way required
  • To prepare by treating something in a certain way
  • To adopt a set of actions that produce a result
  • To convert by putting something through a machine

percent

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US / pə'sent /

UK / pɚˈsɛnt /

A2
  • adverb
  • One one-hundredth of a whole; the symbol %

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

store

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US / stɔ:(r) /

UK / stɔr, stor /

A2
  • noun
  • Place where things are kept for future use
  • Place where you can go to buy things
  • verb
  • To put things in a place for later use

fertilization

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US / ˌfɜ:təlaɪ'zeɪʃn /

UK / ˌfɚtlɪˈzeʃən /

B1
  • noun
  • Process of a sperm entering an egg in reproduction

hundred

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US / 'hʌndrəd /

UK / ˈhʌndrɪd /

A1
  • number
  • 100

group

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US / ɡru:p /

UK / ɡrup /

A1
  • noun
  • Two or more musicians who play music together
  • Number of people or things gathered together
  • verb
  • To combine or collect objects or people together

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

film

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US / fɪlm /

UK / fɪlm /

A2
  • noun
  • Thin layer that covers something
  • Movie
  • verb
  • To record moving action with a camera

next

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US / nekst /

UK / nɛkst /

A1
  • adverb
  • The one that follows another in time or order
  • At a time or place directly after the present one
  • noun
  • The one that follows after
  • adjecitve
  • Immediately after the previous one
  • First occurrence after the present one

swimmer

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US / ˈswɪmə(r) /

UK / ˈswɪmər /

A1
  • noun
  • Someone who does swimming, e.g. as a sport

collaboration

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US / kəˌlæbəˈreɪʃn /

UK / kəˌlæbəˈreɪʃn /

B1
  • noun
  • Act of working with someone to complete a task

educator

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US / ˈedʒukeɪtə(r) /

UK / ˈɛdʒəˌketɚ /

A2
  • noun
  • Someone who teaches

full

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US / fʊl /

UK / fʊl /

A1
  • adjecitve
  • Containing all the parts; complete
  • Containing or holding as much as possible
  • Having had enough food
  • adverb
  • In a direct manner; completely

break

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US / breɪk /

UK / brek /

A1
  • noun
  • Time you stop an activity before continuing
  • End of a relationship
  • An escape from a place such as a jail
  • (Lucky) advantage or benefit from something
  • Find a solution or answer to a problem or crime
  • Change in the weather
  • verb
  • To create a new record e.g. running the 100m dash
  • To form a crack in something
  • To burst or become damaged
  • To end a relationship
  • To escape from a place such as a jail
  • To train a wild animal e.g. a horse
  • To separate into pieces by force, or by dropping
  • To act against a law, rule, or promise
  • To become known suddenly, as in the news
  • To not do what you promised e.g. not keep promises
  • To solve a crime, or answer a problem
  • To stop functioning properly
  • To suddenly start, open or commence
  • To change in pitch suddenly, as in a voice
  • To fall on the shore, as in waves
  • To begin or change suddenly; the dawn or weather
  • To defeat by causing the person to lose their will

increase

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US / ɪn'kri:s /

UK / ɪnˈkris /

A1
  • noun
  • Fact of increasing; amount something grows by
  • verb
  • To make or become larger in size or amount

hear

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US / hɪə(r) /

UK / hɪr /

A1
  • verb
  • To be aware of sound; to perceive with the ear
  • To be told or find out information or facts
  • To consider or listen to a court case

sammy

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US / ˈsæmi /

UK / ˈsæmi /

A1
  • noun
  • An American soldier fighting in the First World War (1914–18).

complete

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US / kəm'pli:t /

UK / kəmˈplit /

A1
  • adjecitve
  • Being finished; done; achieved
  • Being as perfect and as total as could be
  • verb
  • To finish or reach the end of doing something

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

cream

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US / kri:m /

UK / krim /

B1
  • adjecitve
  • Pale color that is yellowish white
  • noun
  • Type of a thick beauty product used on the skin
  • Thick liquid rubbed into the skin
  • The top part of milk when left standing
  • verb
  • To defeat someone with ease
  • To have added cream
  • To mix together into a thick substance or liquid

foot

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US / fʊt /

UK / fʊt /

A1
  • noun
  • Base of something such as a mountain or vase
  • Length of 12 inches or about 25 cm
  • Lowest part of the leg we use to stand on

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

repeat

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US / rɪˈpi:t /

UK / rɪˈpit /

A2
  • noun
  • Action that is done again
  • Musical passage that is to be played again
  • Radio or television program that was shown before
  • verb
  • To do something over again
  • To say something you have learned and memorized
  • To relate something you have been told by another
  • To say something again

often

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US / ˈɔfən /

UK / ˈɔfən,ˈɑfən,ˈɔftən,ˈɑf- /

A1
  • adverb
  • Many times; frequently; on many occasions

moment

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US / 'məʊmənt /

UK / 'moʊmənt /

A1
  • noun
  • Very short or brief period of time
  • A particular period in time

turtle

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US / ˈtɜ:tl /

UK / ˈtɜ:rtl /

B1
  • noun
  • Animal that lives in water and has a hard shell

community

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US / kə'mju:nətɪ /

UK / kəˈmjunɪti /

A2
  • noun
  • Group of people who share a common idea or area

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

build

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US / bɪld /

UK / bɪld /

A1
  • noun
  • Your physical shape; physique
  • verb
  • To establish e.g. a reputation, over time
  • To construct a house, office, factory

old

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US / əʊld /

UK / old /

A1
  • adjecitve
  • Having existed for a long time, not young or new
  • Age of a person since birth

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

activity

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US / æk'tɪvətɪ /

UK / ækˈtɪvɪti /

A1
  • noun
  • An action or task, e.g. sports, washing clothes

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

chip

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US / tʃɪp /

UK / tʃɪp /

B1
  • noun
  • Small piece that has broken off (e.g. from cup)
  • Piece of computer hardware that does calculations
  • Thin piece of fried potato or other food
  • Act of hitting a ball high but not very far
  • verb
  • To break a small piece off something such as a cup
  • To break into small pieces, often with a tool
  • To hit or kick a ball high but not very far

bring

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US / brɪŋ /

UK / brɪŋ /

A1
  • verb
  • To take or go with someone to a place

metaphase

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US / 'metəfeɪz /

UK / 'metəˌfeɪz /

A1
  • other
  • The second stage of meiosis
  • The second stage of mitosis

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

slight

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US / slaɪt /

UK / slaɪt /

B1
  • adjecitve
  • Small (amount, quality)
  • Appearing thin, delicate and physically weak
  • noun
  • Rude and disrepectful treatment
  • verb
  • To ignore or treat rudely and with no respect

basket

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US / ˈbɑ:skɪt /

UK / ˈbæskɪt /

A2
  • noun
  • Amount contained in a basket; a basketful
  • Container made of strips of (often) woven wood
  • Net with a hoop used in basketball

cytokinesis

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US / /

UK / /

A1
  • other
  • Organic process consisting of the division of the cytoplasm of a cell following karyokinesis bringin

direction

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US / də'rekʃn /

UK / dɪˈrɛkʃən, daɪ- /

A2
  • noun
  • When someone tells people what to do
  • Describes the way you are going, e.g. North

cheddar

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US / ˈtʃedə /

UK / ˈtʃɛdɚ /

B2
  • noun
  • A type of cheese

else

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US / els /

UK / ɛls /

A1
  • adverb
  • Otherwise; if you fail to
  • (Of person place thing etc.) besides; in addition

nose

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US / nəʊz /

UK / noʊz /

A1
  • noun
  • Part of the face used for breathing and smelling
  • Front, pointed end of e.g. airplane or rocket
  • verb
  • To push with your face so you can smell something

section

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US / 'sekʃn /

UK / ˈsɛkʃən /

B1
  • noun
  • A part of a whole
  • Specific area or region within a larger place
  • Specific group of people from a larger group
  • Part of a book, newspaper, etc.
  • verb
  • To divide something into smaller parts

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

hookup

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US / 'hʊkʌp /

UK / 'hʊkˌʌp /

A1
  • other
  • A device providing a connection between a power source and a user
  • A system of components assembled together for a particular purpose

human

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US / 'hju:mən /

UK / ˈhjumən /

A1
  • adjecitve
  • Concerning or characteristic of people
  • noun
  • A person; a man, woman or child

nice

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US / naɪs /

UK / naɪs /

A1
  • adjecitve
  • Being attractive or of high quality or value
  • Good or enjoyable
  • Being kind or friendly

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

miss

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US / mɪs /

UK / mɪs /

A1
  • noun
  • Action of not hitting something or someone
  • Form of address to unmarried girl or woman
  • verb
  • To be absent
  • To fail to hit something e.g. a ball
  • To do without something
  • To fail to see or sense something
  • To fail to understand someone's message
  • To be too late to ride on something e.g. train
  • To feel you want to see someone who is not there

twin

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US / twɪn /

UK / twɪn /

A2
  • noun
  • Two children born from same mother at same time
  • One of two things that closely resemble each other

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

everything

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US / 'evrɪθɪŋ /

UK / ˈɛvriˌθɪŋ /

A1
  • pronoun
  • All of the things mentioned

chromosomal

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US / ˌkrəʊmə'səʊməl /

UK / ˌkroʊmə'soʊməl /

A1
  • adjecitve
  • Concerning a chromosome

original

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US / ə'rɪdʒənl /

UK / əˈrɪdʒənəl /

A2
  • adjecitve
  • Being first made, thought or performed; fresh
  • Being unique or thinking differently from others

nondisjunction

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US / ˌnɒndɪsˈdʒʌŋkʃən /

UK / ˌnɑːndɪsˈdʒʌŋkʃn /

A1
  • other
  • Meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abno

male

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US / meɪl /

UK / ˈmel /

A2
  • adjecitve
  • Characteristic of boys or men
  • noun
  • A member of the sex that fertilizes eggs

topic

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US / 'tɒpɪk /

UK / ˈtɑpɪk /

A2
  • noun
  • Subject or issue people talk or write about

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

swap

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US / swɒp /

UK / swɑp /

B2
  • noun
  • A trade or exchange of goods without using money
  • verb
  • To exchange goods without spending money; trade

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

comfortable

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US / ˈkʌmftəbl /

UK / ˈkʌmfətəbəl, ˈkʌmftəbəl /

A2
  • adjecitve
  • Having more than enough e.g. money for your needs
  • Being relaxed, warm or happy

bug

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US / bʌɡ /

UK / bʌɡ /

B1
  • noun
  • An insect
  • Problem in the functioning of computer code
  • Electronic device to spy on someone
  • verb
  • To bother someone
  • To hide an electronic device to spy on someone

chance

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US / tʃɑ:ns /

UK / tʃæns /

A1
  • adjecitve
  • Happening by luck; not planned
  • Taking a risk to try something
  • noun
  • The way something happens without planning
  • An opportunity; favorable circumstances, situation
  • The possibility that something will happen
  • verb
  • To occur just through luck; happen
  • To take a risk to try something

biology

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US / baɪˈɒlədʒi /

UK / baɪˈɑlədʒi /

A2
  • noun
  • The study of living things

fast

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US / fɑ:st /

UK / fæst /

A1
  • adjecitve
  • In a way that is difficult to move or change
  • Moving or able to move quickly
  • Showing time that is later than the actual time
  • adverb
  • With a great deal of speed
  • noun
  • Period of time when a person chooses not to eat
  • verb
  • To refuse food for a long time

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

who

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US / hu: /

UK / hu /

A1
  • pronoun
  • Which person
  • Used to introduce information about people

super

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US / ˈsu:pə(r) /

UK / ˈsupɚ /

A2
  • adjecitve
  • Of the highest quality; great; marvelous

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

both

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US / bəuθ /

UK / boθ /

A1
  • determiner
  • Used to refer to two things at the same time
  • pronoun
  • Used to refer to two things at the same time

functional

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US / ˈfʌŋkʃənl /

UK / ˈfʌŋkʃənəl /

A2
  • adjecitve
  • Useful; not just for decoration

result

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US / rɪ'zʌlt /

UK / rɪˈzʌlt /

A2
  • noun
  • Something produced through tests or experiments
  • Final score of a competition, election or game
  • verb
  • To be the outcome of other causes and effects

remix

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US / ˌri:ˈmɪks /

UK / riˈmɪks /

B2
  • noun
  • A re-engineered and produced version of a song
  • verb
  • To make a new version of a song by mixing elements

symptom

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US / 'sɪmptəm /

UK / ˈsɪmtəm, ˈsɪmp- /

B1
  • noun
  • Sign that suggests that there is a problem

stanky

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US / /

UK / /

A1
  • adjective
  • Having a strong (usually unpleasant) smell; stinking.
  • Of a person, or his or her appearance, behaviour, etc.: disgusting, offensive, unpleasant; worthless
  • Of popular music (especially funk): passionate, forceful, and uncompromising in style or performance

possible

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US / ˈpɒsəbl /

UK / ˈpɑsəbəl /

A1
  • adjecitve
  • Being able or appropriate for a task or purpose
  • Having a chance of happening, or being true

papa

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US / pə'pɑ: /

UK / ˈpɑpə,pəˈpɑ /

B2
  • noun
  • Another word for father

several

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US / ˈsevrəl /

UK / ˈsɛvərəl,ˈsɛvrəl /

A1
  • adjecitve
  • Many of
  • pronoun
  • More than two but not a large amount
  • Subtitles section
  • There's nobody else in the world exactly like you.
  • Not your sibling.
  • Not your third grade classmate who copied everything you did.
  • Not even comically evil alternate universe you.
  • At least hypothetically.
  • But how?
  • I mean, if we're all made of the same biological stuff as not only each other, but also E. coli, then how is it that we turn out genetically unique?
  • Well, buckle up, sport.
  • Hopefully this isn't your first time hearing this, but you were brought into the world by sexual reproduction.
  • And sexual reproduction doesn't make clones, no matter how much people tell you that you have your mother's nose.
  • See, even identical twins have a bunch of slight genetic variations.
  • Instead of making clones, sexual reproduction combines genetic information from two organisms, with each contributing half their genome, which results in offspring with a remix of both parents' DNA.
  • This remix is made by some reproductive DJ cells called gametes, which carry genes from one generation to the next.
  • And to produce gametes, we need a special type of cell division.
  • Myosis.
  • Hi, I'm Papa Sammy, your friendly neighborhood bug dad, and this is Crash Course Biology.
  • Yo, DJ Gammy, hit me with that stanky theme music.
  • Thanks, Dad.
  • When a cell reaches the stage in its life cycle where it needs to create more cells, most of the time it does a little division dance called mitosis.
  • The dance has several steps, but essentially, copied DNA splits apart, eventually parting ways into twin cells.
  • This copy and paste process means that most of our cells contain identical copies of all of our genes, neatly packaged into bundles called chromosomes.
  • But those gorgeous gametes are different.
  • For starters, they form in just one part of the body, the gamete making factories called the gonads.
  • In humans, the female gamete, which is called the ova or egg, gets made in a gonad called the ovary.
  • The male gamete, called the sperm, forms in gonads called the spermary.
  • Just kidding.
  • They're called testes.
  • But there's another big reason gametes are unlike any other cells in your body.
  • See, most of your cells are diploid, meaning double.
  • Diploid cells contain a pair of each chromosome, and each of those pairs is homologous, which means they're matching, but not identical.
  • In humans, that adds up to twenty three pairs and forty six chromosomes in all.
  • Homologous chromosomes are a lot like shoes.
  • If you have a pair of chucks, you've got a left one and a right one, matching, but not identical.
  • That makes them homologous.
  • If you had a pair of the same right footed chucks, those would be identical but not matching.
  • So not homologous, and also not comfortable.
  • And just like I need more than a pair of chucks for a functioning foot wardrobe, you need homologous versions of each type of chromosome to make your cells functional.
  • But gametes are different.
  • Sperm and egg cells need to be single and ready to mingle.
  • They need to fuse with another gamete during sexual reproduction.
  • So they're haploid, meaning they contain half of each homologous pair, and a full set of genes, but only one copy or allele of each gene.
  • That way, when one gamete meets another, they can join forces to make a baby with the complete number of chromosomes.
  • Since it takes two different gametes, a sperm and an egg, to make a baby, they have to be haploid.
  • If they were diploid and contained the full set of chromosomes each, the fertilized egg would end up with twice as many chromosomes as it needs.
  • And since different species have different numbers of chromosomes, most can't reproduce outside of their own kind.
  • Like, ducks tend to have eighty chromosomes.
  • And turtles, depending on the species, have between twenty eight and sixty six.
  • So they could never produce viable offspring.
  • Just one of the many reasons…
  • why we'll never have real life turtle ducks.
  • But how do our bodies—and, for that matter, ducks, turtles, and everything else that reproduces sexually— make cells with half the normal number of chromosomes?
  • Well, to get our gametes game on, we've got to wrench those homologous pairs apart in a process called meiosis.
  • While similar to the process of mitosis,
  • Meiosis is a double round of cell division that produces four new haploid cells after each cycle.
  • It starts with a special reproductive cell called a germ cell.
  • The germ cell hangs out in the gonads, making one copy of each of its chromosomes.
  • Once all of those copies are made, meiosis is ready to begin.
  • It's broken down into two stages, meiosis I and meiosis II, and each stage contains five phases of activity, prophase, metaphase,
  • anaphase, telophase, and cytokinesis.
  • Back in the mitosis episode, we used PASS ME A TACO, CHEF!
  • to remember these phases.
  • And it works for meiosis as well.
  • It all starts with prophase I, when each copied chromosome pairs off with its homologous match, so left shoes with right shoes.
  • Sometimes at this point, the chromosomes swap sections of DNA by exchanging alleles, which are like different flavors of a gene.
  • This process is called, dramatically enough, crossing over.
  • And it's super important because when and if these cells get passed on to offspring, that exchange of alleles helps ensure genetic diversity.
  • But I'll get back to that in a moment.
  • Next up is metaphase one, when long fibers called spindles start reaching out to the chromosomes.
  • Hey, um...
  • I just saw you at the metaphase plate, and I just thought I'd reach out.
  • These spindles pull the chromosomes into a row across the cell's center at random, until they look like they're ready for a line dance.
  • Cha cha now, y'all!
  • Then, in anaphase I,
  • the spindle tugs the chromosome pairs apart, so they're now on opposite ends of the cell, clustering into two separate randomized bunches.
  • Then, with telophase I, a membrane seals each group into a separate nucleus.
  • All animal, plant, and fungal cells have these nuclei that contain their chromosomes.
  • So this is the step in division where the offspring cells are starting to actually look like cells.
  • Cytokinesis takes over at that point, pinching the groups off into two separate cells, each new cell with only half the chromosomes the original cell started with.
  • In meiosis II, the five phases roughly repeat.
  • The chromosomes clump together in prophase II.
  • But because the homologous pair is already split, there's nobody to pair off with this time.
  • Metaphase II lines those lone chromosomes up across the center of the cells once more, until anaphase II wrenches them in half.
  • Their halves drift to opposite ends of both cells so that telophase II can wrap them into four separate nuclei.
  • Then cytokinesis pinches the jelly ish stuff around those nuclei until we end up with four separate haploid cells.
  • Each has some, but not all, of the same DNA.
  • And the gamete gambit is complete.
  • Most of the time, meiosis runs smoothly.
  • But sometimes, chromosomes fail to split apart at the right phase.
  • We call this non disjunction.
  • When it occurs, gametes end up with extra or fewer chromosome copies than usual.
  • Those gametes could still merge with another gamete that has the usual haploid number.
  • And that fertilized cell can even sometimes develop into living offspring.
  • But the offspring will have a different number of chromosomes than what's typical for their species.
  • often they'll have traits associated with those extra or missing chromosomes.
  • Other times, though, the math just doesn't work out, and the fertilized cell doesn't develop at all.
  • In humans, one of the most widely known examples of a chromosomal condition brought on by nondisjunction is Down syndrome, which is caused by an extra copy of chromosome XXI.
  • In this case, Down syndrome comes with visible signifiers, but sometimes, having an extra copy of a chromosome doesn't cause any noticeable change.
  • For instance, people with trisomy X have an extra copy of the X chromosome, and for many, it results in no symptoms.
  • At this point, you might be thinking, wow, there's a lot that goes into this meiosis business.
  • Somehow making an identical clone of yourself sounds easier than this sexual reproduction thing.
  • After all, some corners of the kingdom of life do simply clone themselves when they reproduce.
  • We'll get into more of that in episode forty seven.
  • But there's an evolutionary reason we aren't all just carbon copies of our parents.
  • And it all comes back to our old friend, genetic diversity.
  • Evolution's way of not putting all your eggs in one basket.
  • At the species level, having babies with different DNA is kind of like selling multiple kinds of chips in your corner store.
  • Like, you could sell only cheddar and sour cream ruffles.
  • I mean, why not?
  • They have it all.
  • As a chip, cheddar and sour cream is living its best life.
  • But then you're really banking on cheddar and sour cream fans, and you're in dire straits if tastes change or there's suddenly a massive shortage.
  • But if you also stock Cool Ranch Doritos, salt and vinegar chips, and Fuego Takis for good measure, you appeal to broader tastes, and it's more likely that your store stays in business.
  • There's a similar evolutionary strategy going on with genetically unique offspring.
  • Meiosis mixes and splits DNA, making gametes that are ready to combine chromosomes with other gametes.
  • That keeps things spicy, but more importantly, it sustains genetic diversity.
  • Having offspring that aren't exactly like you increases the odds that some of them will be able to survive and reproduce, and pass on their genes, even if surprises pop up in the environment.
  • Meiosis actually has a few different tricks for ensuring genetic diversity.
  • Like, remember how crossing over sometimes happens during prophase I?
  • Homologous pairs swap sections of chromosomes, like I trade Pokemon.
  • By the way, I'm looking for a shiny Scyther if anybody's got the hookup.
  • Except, chromosomes are actually trading alleles from both parents.
  • So when each pair splits, the individual chromosomes have a totally new combination of both parents' DNA.
  • That's because not only are gametes different from the starting cell, but they're also different from each other, even if they started from the same cell.
  • Genetic variation is also helped along by the aimlessness of the process during prophase I. When chromosome pairs line up across the center of the cell, preparing to shift to either side, the direction that these pairs line up is random.
  • And the direction one pair takes doesn't influence any other.
  • We call that independent assortment.
  • Even when meiosis is over, random fertilization keeps building on that potential for variation.
  • This describes the randomness of which particular egg ends up fusing with which particular sperm.
  • Myths about the fastest swimmers fertilizing the egg aren't true.
  • In fact, the fertilization process is basically a giant lottery.
  • it's mostly down to chance.
  • And in humans, the particular combination of chromosomes in that egg and that sperm each represent just one of eight million possible arrangements.
  • That's not even counting any additional unique combinations that might have happened during crossing over.
  • And when egg and sperm combine, those possibilities compound.
  • You're not just one in a million.
  • You're one in...
  • Sixty four trillion.
  • Give or take a few.
  • Without meiosis, you wouldn't be you.
  • Gametes are the only meiosis made cells in our bodies.
  • And it's because of that process that you're not a clone.
  • You're unique.
  • So even if you end up with your mom's nose or your dad's debonair smile, thanks to that random recombination of genetic material, your DNA test says that you one hundred percent that bae.
  • And if you think meiosis was a wild ride, just wait until we dig into genetics and start learning how alleles get expressed in traits.
  • But that's next time.
  • Until then, peace!
  • This series was produced in collaboration with HHMI BioInteractive.
  • If you're an educator, visit biointeractive.org slash Crash Course for classroom resources and professional development related to the topics covered in this course.
  • Thanks for watching this episode of Crash Course Biology.
  • which was filmed at our studio in Indianapolis, Indiana, and was made with the help of all of these folks right here.
  • Very nice people.
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  • All right, bye now.
  • I'll see y'all later.
  • Don't you be a stranger now.