Question

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

Explanation:

• Option 1: Allele frequencies can change due to factors like natural selection, genetic drift, etc., so this is incorrect.
• Option 2: Random mating is part of Hardy - Weinberg equilibrium assumptions (where frequencies stay same), but the question is about how frequency increases, so this is incorrect.
• Option 3: By definition, an increase in allele frequency means the allele becomes more common in the population.

Answer:

C. An allele becomes more common in a population.