In Hardy-Weinberg equilibrium, allele frequencies are expected to remain constant from generation to generation.

• A. Change from generation to generation due to selection.
• B. Remain constant from generation to generation.
• C. Randomly drift due to migration changes.
• D. Collapse due to mutation.

Answer: (B)

Under Hardy-Weinberg, allele frequencies in the gene pool stay the same from one generation to the next when there’s no evolutionary influence. If p is the frequency of one allele and q = 1 − p for the other, these p and q values remain constant across generations. What changes is how those alleles combine into genotypes: the proportions become p^2 for homozygous of one type, 2pq for heterozygotes, and q^2 for the other homozygote. So the statement is correct because the allele proportions themselves don’t drift or shift in an ideal population. If any evolutionary force acts—selection, migration, mutation, or genetic drift—the allele frequencies can change over generations.