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6.4 Classification of living organisms

6.4 Classification of living organisms

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Question 33
H

Scientists propose the following evolutionary history for living species P, Q and R and extinct species X:

  • The lineage leading to P separated first.
  • The remaining lineage later divided into two branches. One led to X; the other subsequently divided into Q and R.
  • The branch leading to X became extinct.

Fossils of X have some skeletal features found in Q and R. No DNA from X is available.

Which conclusion and source of evidence are consistent with this history?

[1]
A

X was the direct ancestor of Q and R; its fossil structures support this placement.

B

X shares a newer ancestor with P than Q; living classification supports this placement.

C

X shares a newer ancestor with Q than P; its fossil structures support this placement.

D

X was the direct ancestor of Q and R; living classification supports this placement.

Markscheme

6.4 Classification of living organisms Questions

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

40 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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