The change in frequency of alleles at a locus that occurs by chance is which of the following?

Explanation

The change in frequency of an allele at a locus that occurs by chance is called genetic drift. Genetic drift is a random process that can cause fluctuations in allele frequencies within a population over time, often leading to the fixation or loss of alleles. This effect is more pronounced in smaller populations, where random events can have a larger impact. In contrast, mutation introduces new genetic variations, selection acts based on environmental advantages, and non-random mating is driven by mate choice preferences-all of which are not primarily driven by chance.