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4.1 Evolution and natural selection

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Question 7
F

Warfarin is a poison used to kill rats. Warfarin was first used in one area in 1960.

Some rats have an allele that makes them resistant to warfarin.

The Figure shows the percentage of rats in this area that were resistant to warfarin between 1960 and 1990.

Figure

image

a.

Use the Figure to give the percentage of rats that were resistant to warfarin in 1975.

[1]
b.

Calculate how many times greater the percentage of resistant rats was in 1990 than in 1965.

[2]
c.

Explain the change in the percentage of resistant rats between 1960 and 1990.

[3]
d.

Suggest why the percentage of resistant rats increased slowly between 1960 and 1965.

[1]
Markscheme

4.1 Evolution and natural selection Questions

  1. GCSE
  2. /Biology
  3. /4.1 Evolution and natural selection

44 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.

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