Heredity, Natural Selection, and Evolution

Early Studies in Heredity

Who developed the Punnett square?

Geneticist Reginald Punnett (1875–1967) invented a table called the Punnett square for displaying the genetics cross, which graphically represented Mendel’s laws of segregation and independent assortment. He was the founding member of the Genetical Society and, along with English geneticist William Bateson (1861–1926), created the Journal of Genetics. Punnett was particularly interested in the genetics of chickens, discovering a sex-linked characteristic that was used to separate male and female chicks after hatch-ing—this was especially important in improving food production after World War I.


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