A population of giraffes shows variation in neck length. A drought causes most low-growing vegetation to die, leaving only tall trees with leaves. Which statement best describes what is likely to happen to the population?

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Question

A population of giraffes shows variation in neck length. A drought causes most low-growing vegetation to die, leaving only tall trees with leaves. Which statement best describes what is likely to happen to the population?

Accepted Answer

Giraffes with longer necks will be more likely to survive, reproduce and pass on alleles for long necks — Award 1 mark for correctly describing natural selection acting on existing variation. A is incorrect — acquired characteristics (changes during lifetime) are not inherited. C is incorrect — the environment does not cause specific directed mutations. D is incorrect — evolution is not a conscious choice.

Answer

The environment will cause a mutation for longer necks in all giraffes

Answer

Giraffes with longer necks will be more likely to survive, reproduce and pass on alleles for long necks

Answer

Giraffes will choose to evolve longer necks

Answer

All giraffes will grow longer necks during their lifetime

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