AP BIOLOGY

Detailed explanation-1: -So the correct answer based on the question or the option even, is genetic drift.

Detailed explanation-2: -There are four key mechanisms that allow a population, a group of interacting organisms of a single species, to exhibit a change in allele frequency from one generation to the next. These are evolution by: mutation, genetic drift, natural selection, and gene flow.

Detailed explanation-3: -Chromosome number is not a factor that influences natural selection. The other three choices represent factors that drive the process of natural selection. Random mutations in DNA provide genetic variation in a population of species and allow for natural selection to occur.

Detailed explanation-4: -Natural selection is a simple mechanism that causes populations of living things to change over time. In fact, it is so simple that it can be broken down into five basic steps, abbreviated here as VISTA: Variation, Inheritance, Selection, Time and Adaptation.