AP BIOLOGY

Detailed explanation-1: -The process of mutation provides each generation with many new genetic variations.

Detailed explanation-2: -Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection).

Detailed explanation-3: -Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.

Detailed explanation-4: -Answer and Explanation: Genetic variation is maintained in most populations through the periodic introduction of new alleles or new allele frequencies from outside the population.