LIFE SCIENCE

Detailed explanation-1: -Mutation creates new genetic variation in a gene pool. Gene flow and genetic drift alter allele frequencies in a gene pool.

Detailed explanation-2: -Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events.

Detailed explanation-3: -Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population violates the Hardy-Weinberg assumptions, and evolution occurs.

Detailed explanation-4: -The factors that cause allele frequencies to change are called the forces of evolution. There are four such forces: mutation, gene flow, genetic drift, and natural selection.

Detailed explanation-5: -Sexual reproduction results in infinite possibilities of genetic variation. In other words, sexual reproduction results in offspring that are genetically unique. They differ from both parents and also from each other.