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5.2 Natural selection and evolution

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Question 17
H

Rock pocket mice live in deserts in North America. Their fur can be sandy-coloured or dark.

  • Most of the desert is covered by light, sandy-coloured rock.
  • Some areas are covered by dark rock from old lava flows.
  • Owls hunt the mice by sight.
  • Dark fur is caused by a mutation in one gene.

Scientists recorded the percentage of mice with dark fur in two areas.

The Table shows the results.

Table

AreaPercentage of mice with dark fur
light, sandy-coloured rock3
dark lava rock95

Explain how the populations of mice in the two areas have come to have such different percentages of mice with dark fur.

[6]
Markscheme

5.2 Natural selection and evolution Questions

  1. GCSE
  2. /Biology
  3. /5.2 Natural selection and evolution

122 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.

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