Gene Flow ____

Question

Gene flow ____.  
A) has a stabilizing influence on allele frequencies between two populations
B) speeds up the divergence of two populations
C) increases divergence between populations
D) is promoted by isolating mechanisms
E) promotes inbreeding

Accepted Answer

Gene flow occurs when individuals move between populations and bring new alleles with them. This process tends to have a homogenizing effect on allele frequencies between populations, which can help to stabilize them over time. Therefore, choice A is the best answer. Choice B is incorrect because gene flow tends to reduce genetic divergence between populations, not increase it. Choice C is also incorrect for the same reason. Choice D is incorrect because isolation mechanisms (such as geographic barriers or reproductive barriers) tend to reduce gene flow rather than promote it. Choice E is incorrect because gene flow tends to reduce inbreeding by introducing new genetic variation into a population.