Figure 4From: A missense mutation in growth differentiation factor 9 (GDF9) is strongly associated with litter size in sheepQQ-plot of p -values with GDF9 c.1111G>A SNP included. Comparison of p-value distributions when the GDF9 c.1111G>A SNP is added to the dataset (A), and when the GDF9 c.1111G>A SNP genotypes is included in the model as a covariate (B). The expected –log10(p) on the x-axis and the observed –log10(p) on the y-axis.Back to article page