In a large, randomly mating population that meets all assumptions of Hardy-Weinberg equilibrium (no mutation, migration, selection, or genetic drift), what happens to allele and genotype frequencies across generations?

• A. Genotype frequencies remain constant but allele frequencies change each generation due to recombination.
• B. Allele frequencies and genotype frequencies remain constant from generation to generation unless an evolutionary force acts.
• C. Allele frequencies change over time because dominant alleles always increase in frequency.
• D. Heterozygotes are gradually eliminated, causing genotype frequencies to shift toward homozygotes even without selection.

Answer: (B)