Mid-parent / offspring correlation as an estimation of heritability

    The red dots show the correspondence between the phenotype values of the offspring (Y-axis) and the mid-parent (the average of the two parents) (X-axis). The red line is the calculated regression line, which corresponds to the heritability (h2). Perfect heritability would be indicated by a line with slope = 1.0 (dashed blue line). Here, the points are somewhat more scattered, and the slope and heritability are calculated as h2 = 0.5.

Figure ©2002 by Griffiths et al.; all text material ©2013 by Steven M. Carr