"If A denotes one of the two constant traits, for example, the dominating one, a the recessive, and the Aa the hybrid form in which both are united, then the expression: gives the series for the progeny of plants hybrid in a pair of differing traits."

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Source : Gregor Mendel, Alain F. Corcos, Floyd V. Monaghan (1993). “Gregor Mendel's Experiments on Plant Hybrids: A Guided Study”, p.96, Rutgers University Press

Gregor Mendel

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