Which of the following is an example of genetic drift?

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Genetic drift refers to random fluctuations in allele frequencies in a population. A random mutation introducing a new trait would lead to a change in allele frequencies and is an example of genetic drift. Migration (choice B) and the movement of a certain gene through a population (choice C) may affect allele frequencies, but they are not necessarily random events and do not necessarily qualify as genetic drift.

Which of the Following Is an Example of Genetic Drift