AP BIOLOGY

Detailed explanation-1: -gene flow, also called gene migration, the introduction of genetic material (by interbreeding) from one population of a species to another, thereby changing the composition of the gene pool of the receiving population.

Detailed explanation-2: -Genes are added to a population’s gene pool in two ways. First, mutations can add new genes through the spontaneous alteration of an allele into a new allele that has never existed before. Second, gene flow adds genes to a gene pool by introducing new genes through mating with organisms from outside of the population.

Detailed explanation-3: -Gene flow is the movement of genes into or out of a population. Such movement may be due to migration of individual organisms that reproduce in their new populations, or to the movement of gametes (e.g., as a consequence of pollen transfer among plants).

Detailed explanation-4: -Gene flow occurs only as a result of migrations. Gene flow can cause new alleles to enter a population’s gene pool.