Mendel's experiments on hybridization in Pisum
Monohybrid cross

    Crosses between pure-breeding yellow peas and pure-breeding green peas invariably produces an F1 generation comprising entirely yellow peas. Cross between these offspring produce F2 offspring with a characteristic ratio of 3 yellow peas to 1 green pea.

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