Question

Under which condition would a mutation have the most impact on allele frequency?

Answer 1

I   believe the best answer choice for this question is D. there is no gene flow.

Answer 2

The correct answer is option D, there is no gene flow

Reason-

As the genes flow between the two species, the genotype and phenotype variations between the two species reduces. This is so because the genetic variation between the two species narrows down with exchange of genetic material or allele. Thus, the higher two different individuals do not mate together the more or high will be the expression of a specific allele in a gene.