Variation & Evolution (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards

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Variation
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Two factors determining phenotype

Genotype and environment

Definition of genotype

The genes an organism inherited

How genes pass from parents

In sex cells

What creates genetic variation

Combining genes from mother and father

Only organisms with same genotype

Identical twins

What environment means in variation

Conditions organism grows and develops in

Environmental effect example in animals

Scars

Environmental effect example in plants

Smaller and yellow leaves

Example of genetics + environment trait

Weight

What introduces genetic variation

Mutations in DNA sequence

Effect of most mutations

No effect on phenotype

Outcome when mutation is advantageous

Natural selection makes it common quickly

How genetics affects weight

Speed of breakdown & fat storage

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