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4.1 Evolution and natural selection

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Question 15

Scientists compare DNA sequences of the same length from three groups of organisms. The table shows the number of base differences between each pair.

Groups comparedNumber of base differences
Bacteria and Archaea31
Bacteria and Eukaryota28
Archaea and Eukaryota12
a.

State which pair of groups is most closely related according to the data.

[1]
b.

Explain what the data suggest about the classification of Bacteria and Archaea.

[2]
Markscheme

4.1 Evolution and natural selection Questions

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

85 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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