Outline5 marksStandard
Outline the process by which the formation of a mountain range can lead to allopatric speciation. Also outline how analysis of DNA sequence data could provide evidence that two populations have become separate species.
CAIE A Level Biology 9700 · Selection and evolution
Selection and evolution: outline question
How this question is marked
5 marks, so the mark scheme is looking for about 5 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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