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The change of the light-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) is due to

1. mutation
2. regeneration
3. genetic isolation
4. temporal isolation

Correct answer: mutation

Solution

The dark variety arose because a genetic change produced a new allele affecting coloration. That kind of heritable change is a mutation, not an isolation mechanism or regeneration.

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