What is genotypic frequency?

What is genotypic frequency?

• A. Frequency of the alleles at a locus
• B. Rate of mutation
• C. Proportion of heterozygotes only
• D. Frequency of the genotypes at the locus

Answer: (D)

Genotypic frequency is the proportion of individuals in a population that have each genotype at a specific locus. It describes how common the different genotype combinations are across the population. For a locus with two alleles A and a, with frequencies p and q (p + q = 1), the expected genotype frequencies under random mating are p^2 for AA, 2pq for Aa, and q^2 for aa. These three values add up to 1 and together show the full distribution of genotypes. This is different from allelic frequency, which looks at the proportion of each allele in the gene pool (p and q). It’s also not a mutation rate, which is about how often new mutations occur. And focusing on heterozygotes alone would ignore the homozygous genotypes, giving only part of the picture.

Genotypic frequency is the proportion of individuals in a population that have each genotype at a specific locus. It describes how common the different genotype combinations are across the population.

For a locus with two alleles A and a, with frequencies p and q (p + q = 1), the expected genotype frequencies under random mating are p^2 for AA, 2pq for Aa, and q^2 for aa. These three values add up to 1 and together show the full distribution of genotypes.

This is different from allelic frequency, which looks at the proportion of each allele in the gene pool (p and q). It’s also not a mutation rate, which is about how often new mutations occur. And focusing on heterozygotes alone would ignore the homozygous genotypes, giving only part of the picture.