CAIE A-Level Biology 17.3.2 DNA Evidence for Evolution

Practise comparing DNA, mtDNA or amino-acid sequences to infer common ancestry, relative relatedness and divergence time, while evaluating uncertainty.

Exam points

compare sequence differences to infer relative relatedness and common ancestry
use mutation rate as a molecular clock and explain uncertainty in divergence dates

[Maximum number: 3]

Variation exists in populations of a species and this may provide the opportunity for evolution to occur.

The theory of evolution is supported by DNA sequence data.

Explain how DNA sequences are used to show evolutionary relationships between species.

Figure for Question 17.3.2—DNA evidence for evolution question 1 — CAIE A-Level Biology A2

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17.3.2—DNA evidence for evolution question 1