Allele frequency is a fundamental concept in population genetics that quantifies how often a specific allele appears within a population's gene pool. Still, unlike genotype frequency, which describes the proportion of individuals with a particular genetic makeup, allele frequency focuses on the gene variants themselves, regardless of whether they are dominant or recessive. This metric provides the raw data necessary to understand evolutionary processes, genetic diversity, and the molecular underpinnings of inherited traits. In any sexually reproducing population, alleles exist at specific loci on chromosomes, and their relative abundances can shift over generations due to various biological and environmental forces.
The concept becomes particularly powerful when examined through the lens of the Hardy-Weinberg principle, which offers a mathematical baseline for detecting changes in allele frequency over time. In a theoretically ideal population—one that is infinitely large, randomly mating, free from migration, mutation, and natural
