Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Genetic drift is a random change in allele frequencies that occurs in a small population. When a small number of parents produce just a few offspring, allele frequencies in the offspring may differ, by chance, from allele frequencies in the parents. Answer: genetic drift
What is the term for a random change in allele frequencies that occurs in a small population?