Dihybrid cross

Mendel's experiments on hybridization in Pisum:
Results of a dihybrid cross

    To determine the behavior of the two genes simultaneously (a dihybrid cross), Mendel crossed pure-breeding wrinkled yellow peas with round green peas. The F1 generation all showed the dominant traits for both characters, round and yellow. When he crossed two F1 hybrids, he obtained in the F2 generation all possible combinations of traits, in a characteristic 9:3:3:1 phenotypic ratio.

after figure ©2002 by Griffiths et al.; all text material ©2010 by Steven M. Carr