Question

what is the allele frequency of a population?
evolution
how often an allele occurs in a population
random changes in the population

Explanation:

Allele frequency refers to the proportion or rate at which a particular allele exists within a population. It is calculated by dividing the number of copies of a specific allele by the total number of alleles for that gene in the population. The option "how often an allele occurs in a population" directly aligns with this concept. "Evolution" is a broader process that can be influenced by allele frequency changes but is not the definition of allele frequency itself. "Random changes in the population" is too vague and does not specifically define allele frequency.

Answer:

how often an allele occurs in a population