Adaptation and Competition, Survival and Species

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Where do you find chromosomes?
Inside the nucleus of cells in the body
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What are chromosomes made of?
Long coiled lengths of DNA
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What is a gene? What do genes control?
A gene is a short section of chromosomes
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How many chromosomes do humans have in each body cell?
23 pairs
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How many chromosomes are there in human sperm cells? And egg cells?
23 each
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Describe the structure of a DNA molecule:
A double helix (two chains wound together)
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What does variation mean?
The differences between living species
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What is a characteristic feature?
The differences within species e.g. skin colour, height, flower size
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What is continuous variation?
A feature that can vary over a range of values e.g. height, weight, skin colour, intelligence, leaf area
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What is discontinuous variation?
A feature that can only take certain values e.g. blood group, the colour of courgettes
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Other cards in this set

Card 2

Front

What are chromosomes made of?

Back

Long coiled lengths of DNA

Card 3

Front

What is a gene? What do genes control?

Back

Preview of the front of card 3

Card 4

Front

How many chromosomes do humans have in each body cell?

Back

Preview of the front of card 4

Card 5

Front

How many chromosomes are there in human sperm cells? And egg cells?

Back

Preview of the front of card 5
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