What I've read is that adopted children have IQs that correlate highly to their non-biological adopted siblings as children (there is an effect of environment on IQ) but by adulthood the adopted subjects have IQs with higher correlations to their biological parents and one hypothesis is that the environment the subject chooses to be a part of in adulthood is somehow more greatly modulated by genes than the childhood environment of adopted children, which in turn influences IQ.
Last edited by MotherofToddler; 04/30/13 04:13 PM.
