Paradoxical Features of the Genetics of Intelligence
11th March 2014
The evidence from twin studies, adoption studies and even from DNA evidence is relentlessly consistent: in children, in Western society, the heritability of IQ scores is about 50 per cent. The other half comes equally from family (shared environment) and from unshared individual experiences: luck, teachers, friends.
This numerical precision easily misleads us into thinking genes and environment struggle against each other. In fact, they are like two pillars supporting an arch: nature makes you seek out nurture, which brings out your nature. But here is where things get interesting. The acceptance of genetic influence on intelligence leads to some surprising, even paradoxical implications, some of which turn the assumptions of both the Right and the Left upside down.