Fig. 7. Changes in variance components following selection. 1, 2, 3, and 4 represent the four genetic models, i.e., pure additive yield genes (AD0), partial dominance yield genes (AD1), partial or overdominance yield genes (AD2), and digenic epistasis yield genes (ADE); a, b, and c correspond to the three initial populations identified by gene frequencies 0.1, 0.5, and 0.9, respectively.