Four Genes Controlling Size of Brain, IQ
The microcephaly genes have been hot candidates for a role in the evolutionary expansion of the human brain because mutations in these genes can reduce brain size by about two-thirds, to a size roughly comparable to our early hominid ancestors. There is also evidence that four of the genes -- MCPH1, ASPM, CDK5RAP2 and CENPJ -- have evolved rapidly and have been subject to strong selective pressure in recent human evolution.
"It is obvious that such anatomical changes must have a basis in genetic alterations, said Lars M. Rimol, a research fellow at the University of Oslo. "Until now, little has been known about the molecular processes involved in this evolution and their genetic underpinnings. Now we have a piece of that genetic puzzle." _ScienceDaily
Significant differences in group IQ means between racial categories correlates well with differences in achievement, as measured in a wide range of fields. (see Human Accomplishment)
Much of the dispute regarding the findings of population IQ differences derives from the blatant political bias of egalitarians of a leftist and / or Marxist variety. The late Stephen J. Gould, Dick Lewontin, and others -- see references here -- have attempted to dispute, bully, block, intimidate, and otherwise diminish the results of scientific research relating to IQ, with little success in scientific circles. The mainstream media and mainstream social science and humanities academia hue to leftist political correctness and self-blinding.
But as genetics and genetic anthropology continue to build a solid scientific foundation beneath obvious population macro-differences in aptitude and achievement, room for dispute will shrink accordingly.