Hardy-Weinberg law

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Har·dy-Wein·berg law

 (här′dē-wīn′bûrg)
n.
A fundamental principle in population genetics stating that the genotype frequencies and gene frequencies of a large, randomly mating population remain constant provided immigration, mutation, and selection do not take place.

[After Godfrey Harold Hardy (1877-1947), British mathematician, and Wilhelm , Weinberg (1862-1937), German physician.]