Research has suggested that in the modern world, the relationship between fertility and intelligence is such that those with higher intelligence have fewer children, one possible reason being more unintended pregnancies for those with lower intelligence. Several researchers have argued that the average genotypic intelligence of the United States and the world are declining which is a dysgenic effect. This has been masked by the Flynn effect for phenotypic intelligence. The Flynn effect may have ended in some developed nations, causing some to argue that phenotypic intelligence will or has started to decline.

Eugenics - Wikipedia, the free encyclopedia Friday, October 25, 2013 @ 12:37pm