Figure 6.
Effect of network homophily on (a) the variation in indirect effects, (b) the correlation between direct and indirect genetic effects, (c) the relative change in phenotypic variance within groups, and (d) the relative change in total genetic variation. Each dot represents a simulated network, or group of 50 individuals (N group = 50). Indirect genetic effects were generated using a ψg of 4. Homophily simultaneously increases variation among individuals in indirect genetic effects within groups, and generates a strong positive covariance between direct and indirect genetic effects, thereby substantially increasing the phenotypic variance observed within groups. However, this increase in phenotypic variance is not associated with any change at the genetic level