Dihybrid cross

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

    To determine the behavior of the two genes simultaneously, Mendel made a dihybrid cross of pure-breeding wrinkled yellow peas with round green peas, where the alleles for yellow and round were known to be dominant. All of the F1 generation showed the traits due to the dominant alleles for both characters, yellow. and round. 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 ©2016 by Steven M. Carr