But gene flow is interrupted if the population becomes divided into two groups. One way this happens is by "vicariance," geographical change that can be slow or rapid. An example of vicariance is ...

For example, if heterozygotes at a locus have ... and thus neither is a form of balancing selection. Gene flow is the movement of genes into or out of a population. Such movement may be due ...

For example, if heterozygotes at a locus have ... and thus neither is a form of balancing selection. Gene flow is the movement of genes into or out of a population. Such movement may be due ...