Among populations of various kinds, allele frequency differences at polymorphisms are the rule be- cause of the chance effects known as random genetic drift

polymorphism. Among populations of various kinds, allele frequency differences at polymorphisms are the rule be- cause of the chance effects known as random genetic drift. In other words. as a result of both natural and social events. only some genotypes are transmitted through generations: the others are lost. The lack of predictability in who will