AP BIOLOGY

Detailed explanation-1: -Summary. Unlike natural selection, genetic drift does not depend on an allele’s beneficial or harmful effects. Instead, drift changes allele frequencies purely by chance, as random subsets of individuals (and the gametes of those individuals) are sampled to produce the next generation.

Detailed explanation-2: -Genetic drift is the change in frequency of an existing gene variant in the population due to random chance. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.

Detailed explanation-3: -One major way gene flow is different from natural selection is that gene flow helps keep alleles in a population homogenized while natural selection increases genetic variation and always moves toward creating new species.

Detailed explanation-4: -Genetic drift is a process in which allele frequencies within a population change by chance alone as a result of sampling error from generation to generation. Genetic drift is a random process that can lead to large changes in populations over a short period of time.

Detailed explanation-5: -Genetic drift and natural selection usually occur simultaneously in populations, but the cause of the frequency change is often impossible to determine. Natural selection also affects allele frequency.