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6.4 Classification of living organisms

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Question 3

Scientists compare the same section of DNA in three species of freshwater snail. The results are shown in the table.

Species comparedDNA shared (%)
Reed snail and stone snail91
Reed snail and mud snail74
Stone snail and mud snail76

Which arrangement of branches in an evolutionary tree is supported by these results?

[1]
A

The reed snail and mud snail branches split most recently, and the stone snail branch split earlier.

B

The three snail branches split at the same time because every pair shares most of its DNA.

C

The reed snail and stone snail branches split most recently, and the mud snail branch split earlier.

D

The stone snail and mud snail branches split most recently, and the reed snail branch split earlier.

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6.4 Classification of living organisms Questions

  1. GCSE
  2. /Biology
  3. /6.4 Classification of living organisms

81 exam-style questions on AQA GCSE Biology 6.4 Classification of living organisms, covering 6.4 Classification of living organisms. Each one has a worked solution and a mark scheme showing where the marks go.

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