Microevolution, or evolution at its smallest scale, occurs when
A) an individual's traits change in response to environmental factors.
B) a community of organisms changes due to the extinction of several dominant species.
C) a new species arises from an existing species.
D) a population's allele frequencies change over a span of generations.

Question

Quizplus · Accepted Answer

Microevolution occurs when there is a change in the frequencies of alleles (different versions of genes) within a population over time, usually due to natural selection, genetic drift, or gene flow. This can ultimately lead to changes in traits at the individual level, but the key factor in microevolution is the change in allele frequencies within a population.

Microevolution, or Evolution at Its Smallest Scale, Occurs When