AQA A-Level Biology 2025/6

Biology • A-Level

Question 1 of 41

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A population of beetles becomes divided by the formation of a mountain range. Which evolutionary mechanism is most likely to lead to rapid reproductive isolation between the two groups?

Hint: Consider which process is strongest when populations are small and isolated with little or no migration.

Natural selection for different beak shapes in each group Continued gene flow between the groups across the mountain range Polyploidy arising in one of the groups Genetic drift causing different alleles to become fixed in each isolated group

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