Distribution of hypopigmentation in 113 intercross progeny. Data is represented as described for the 91 backcross progeny outlined in the legend to Fig. 2. Colored blocks placed on the x-axis represent the mean percent hypopigmentation of C3HEdnrb^s/Ednrb^s (green) and MayerEdnrb^s/Ednrb^s (red) parental strains andEdnrb^s/Ednrb^s F₁ hybrids (blue) with one s.d. indicated by parallel lines.