Variation

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What is meant by the term variation?
The differences within a species.
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What is genetic variation?
The combining of genes from two parents - no two species are genetically identical (apart from identical twins).
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How are an organism's characteristics determined?
Genes inherited from their parents, which are passed on in gametes which the offspring develop from.
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What characteristics are determined only by genes?
Eye colour, blood group and inherited disorders.
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What is environmental variation?
When the environment that organisms live and grow in causes differences between members of the same species.
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What characteristics are varied by the environment?
Any difference that has been caused by the conditions something lives in.
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How are most characteristics determined?
By a mixture of genetic and environmental factors.
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Give an example of a characteristic affected by both genetics and the environment and explain how.
The maximum height that an animal or plant could grow to is determined by its genes, but whether it actually grows that tall depends on its environment, e.g. how much food it gets.
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Other cards in this set

Card 2

Front

What is genetic variation?

Back

The combining of genes from two parents - no two species are genetically identical (apart from identical twins).

Card 3

Front

How are an organism's characteristics determined?

Back

Preview of the front of card 3

Card 4

Front

What characteristics are determined only by genes?

Back

Preview of the front of card 4

Card 5

Front

What is environmental variation?

Back

Preview of the front of card 5
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