AP BIOLOGY

Detailed explanation-1: -Natural selection can cause microevolution, or a change in allele frequencies over time, with fitness-increasing alleles becoming more common in the population over generations. Fitness is a measure of relative reproductive success.

Detailed explanation-2: -Microevolution is the change in allele frequencies that occurs over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift.

Detailed explanation-3: -Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events.

Detailed explanation-4: -Microevolution is defined as changes in the frequency of a gene in a population. These are subtle changes that can occur in very short periods of time, and may not be visible to a casual observer.

Detailed explanation-5: -A change in allele frequencies within a population from one generation to the next – even if it involves only a single gene-is evolution. Biologists refer to this change in the gene pool as microevolution because it is evolution on the smallest scale.