AP BIOLOGY

Detailed explanation-1: -Natural selection can cause microevolution (change in allele frequencies ), with fitness-increasing alleles becoming more common in the population.

Detailed explanation-2: -Directional selection leads to increase over time in the frequency of a favored allele.

Detailed explanation-3: -How Do Mutations Impact Allele Frequencies? Mutations add new alleles into a gene pool. This causes a change in the frequency of certain allele combinations in the population, which will cause the population to evolve over time. They are a major evolutionary force that creates new gene variations.

Detailed explanation-4: -Gene duplication, mutation, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.

Detailed explanation-5: -Like mutation, gene flow leads to an increase in the variation present in a population because the migration of individuals into the population leads to the introduction of new alleles. Figure 5.