Question

how can an allele frequency increase? an allele becomes more common in a population. random mating occurs within the population. allele frequencies always stay the same.

Explanation:

Allele frequency refers to how common an allele is in a population. When an allele becomes more common in a population, its frequency increases. Random mating (assuming no other evolutionary forces like mutation, selection, migration, or genetic drift) keeps allele frequencies stable (Hardy - Weinberg equilibrium). And the statement "Allele frequencies always stay the same" is incorrect as evolutionary forces can change them.

Answer:

An allele becomes more common in a population.