Fig. 2
Parental genetic contributions to sons’ non-social behavior and quantitative autistic-like trait variation. The genetic contribution to sons’ a non-social scores and b mSRS-R scores is estimated as the BLUP for each parent. Each symbol represents the mean deviation of the sons within a half-sibling group descended from an individual parent, plotted on the x-axis in an arbitrary order. The wider range of these values in fathers (blue) versus mothers (orange) is highly significant for each behavior measure and leads to the greater σ2g/σ2P and h2 estimates reported in the text. Sample sizes for a were N = 89 fathers and N = 237 mothers and for b were N = 69 fathers and N = 171 mothers. Non-social behavior was measured using slightly different sampling methods between cohorts and was accordingly Z-scored within each cohort to produce the “non-social equivalence score” shown here, whereas mSRS-R scores were measured with the same scale across cohorts and thus did not require transformation