Change in the population of light coloured variety of peppered moth to its darker variety happened due to

Mutation

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Regeneration

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Genetic isolation

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Temporal isolation

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Solution

The correct option is A Mutation
A random gene mutation in an light pepper moth resulted in a dark moth. Due to industrial revelution, when soot covered their habitats which was the tree trunks, these dark moths had a better chance at camouflage and survival. So, they grew well due to less predation in dark environment and the population of the light moth decreased.

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