CAIE A Level Biology 9700 · Selection and evolution

Selection and evolution: outline question

Outline6 marksChallenge

A population of a beetle species is divided by the formation of a mountain range. Outline how this event could lead to the formation of two new beetle species over time, and explain how DNA sequence data could be used to support the evolutionary relationship between the two populations.

How this question is marked

6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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