Sewall write effect is also called as

Isolation

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Gene pool

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Genetic drift

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Gene flow

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Solution

The correct option is C Genetic drift
Genetic drift( also known as Sewall wright effect) is the change in the frequency of an existing gene variant (allele) in a population due to random sampling of organisms. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.
So, the correct answer is " Genetic drift".

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