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6.3 The development of understanding of genetics and evolution

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Question 9

Adult rodents from population R are given regular exercise. Their leg muscles become larger during their lifetimes.

Rodents from population R breed with rodents from population S. The offspring are healthy but infertile.

A student makes two claims about these rodents:

  1. The larger muscles developed through exercise will be inherited by the offspring of the exercised rodents.
  2. Populations R and S belong to the same species because they can produce offspring.

Which statement correctly evaluates the student's claims?

[1]
A

Both claims are supported because exercise changes inherited alleles and producing offspring is enough to define one species.

B

Neither claim is supported because acquired muscle enlargement is not normally inherited and infertile offspring indicate separate species.

C

Only claim 2 is supported because exercise does not change inherited alleles, while any offspring show the populations are one species.

D

Only claim 1 is supported because larger muscles acquired during life are inherited, but infertile offspring indicate separate species.

Markscheme

6.3 The development of understanding of genetics and evolution Questions

  1. GCSE
  2. /Biology
  3. /6.3 The development of understanding of genetics and evolution

71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.

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