Which of the following best summarizes the process of allopatric speciation?

Which of the following best summarizes the process of allopatric speciation? Correct Answer geographic isolation ? reproductive isolation ? differential changes in allele frequencies ? reproductive barriers ? new species

D. Allopatric speciation occurs when a geographic barrier creates reproductive isolation between two parts of what was once originally a single population without reproductive barriers. Once gene flow stops between the two new populations (reproductive isolation), changes in the gene pools of each population can occur independently (by mutation, genetic drift, natural selection, nonrandom mating, or gene flow from a third population). Changes in the gene pool (evolution) of the populations may lead to behavioral, physiological, or structural differences that prevent individuals of the two populations from mating or producing fertile offspring (reproductive barriers). Once these barriers are established, the two populations represent two species.