BRAINCAKE

Hardy Weinberg Equation

Edexcel A-level BiologyGene PoolsLesson 4 of 16

The Hardy-Weinberg equations link allele frequencies to genotype frequencies in a population in equilibrium. For a gene with two alleles, where p is the frequency of the dominant allele and q the frequency of the recessive allele:

p + q = 1
p2 + 2pq + q2 = 1

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Key terms in this lesson

allele frequency
The proportion of all the alleles of a gene in a population that are a particular allele.

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