Two flies that arc both homozygous for the fast allele of alcohol dehydrogenase

Question

Two flies that arc both homozygous for the fast allele of alcohol dehydrogenase are mated (neither has mated previously). They have many homozygous fast offspring and one offspring that is a heterozygote. What evolutionary force is responsible for this result? Mutation Migration Genetic drift Natural selection A large sample of flies from the population in question 2 is moved to a new habitat. There are no flies existing here. There is a lot more fermenting fruit (and thus alcohol) in this environment compared to the original environment. Over 10 generations the frequency of the fast allele increases from 0.3 to 0.6. What evolutionary force is responsible for this result? Mutation Migration Genetic drift Natural selection

Explanation / Answer

ANS 3 A mutation

Mutation is the most likey evolutionary force behind the production of a heterozygous progeny. In the absence of mutation , wherein the population possess a single allele for the gene, the other allele gets eventually eliminated. SO the mutation brings back the lost allele back into the gene pool.

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