BRAINCAKEAllele Frequency
The allele frequency is the proportion of all the alleles of a gene in a population that are a particular allele. It is a number between 0 and 1, and the frequencies of all the alleles of a gene add up to 1.
Allele frequency can be calculated directly when every genotype can be identified, for example with codominant alleles, or when genotypes are known from DNA testing. Each individual carries two alleles, so the total number of alleles is twice the number of individuals.
allele frequency = number of copies of the allele / total number of alleles of that gene
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Key terms in this lesson
- genotype frequency
- The proportion of individuals in a population that have a particular genotype.
More in Gene Pools
- Population Genetics
- Hardy Weinberg Equilibrium
- Hardy Weinberg Equation
- Conditions of the Hardy Weinberg Equilibrium
- Mutations
- Non-Random Mating
- Different Sized Populations
- Isolation
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