Question 105

A new allele gives some beetles better camouflage on the bark where the population lives. What happens to that allele in the population?

It spreads to every beetle within a single generation
It stays as rare as it was, since one allele cannot change a population
It becomes more common over many generationsCorrect answer
It disappears, as new alleles are lost

Explanation

Beetles carrying the allele are eaten less often, so more of them survive to breed and a larger share of the following generation inherits it, and repeating that raises its share of the population step by step. It cannot reach every beetle at once, because the beetles that already lack it do not gain it during their lives.

Explanation

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