A NY Times article explains that evolution did not grind to a halt a long time ago, but has continued during the past few thousand years:
Historians often assume that they need pay no attention to human evolution because the process ground to a halt in the distant past. That assumption is looking less and less secure in light of new findings based on decoding human DNA.
People have continued to evolve since leaving the ancestral homeland in northeastern Africa some 50,000 years ago ...
This shouldn't be surprising. Common sense ought to tell us that the different races were the result of continuing evolution. In fact, the article reveals that genes cluster in groups that, not coincidentally, correlate with the known races. Yes, the research shows that those leftist/liberal PC people who have been saying that race is purely a sociological concept are dead wrong. Race is based on genetic differences.
The article also mentions the important fact that brain genes have also been evolving:
Another puzzle is presented by selected genes involved in brain function, which occur in different populations and could presumably be responses to behavioral challenges encountered since people left the ancestral homeland in Africa.
But some genes have more than one role, and some of these brain-related genes could have been selected for other properties.
Two years ago, Bruce Lahn, a geneticist at the University of Chicago, reported finding signatures of selection in two brain-related genes of a type known as microcephalins, because when mutated, people are born with very small brains. Two of the microcephalins had come under selection in Europeans and one in Chinese, Dr. Lahn reported.
He suggested that the selected forms of the gene had helped improved cognitive capacity and that many other genes, yet to be identified, would turn out to have done the same in these and other populations.
Neither microcephalin gene turned up in Dr. Pritchard’s or Dr. Williamson’s list of selected genes, and other researchers have disputed Dr. Lahn’s claims. Dr. Pritchard found that two other microcephalin genes were under selection, one in Africans and the other in Europeans and East Asians.
Even more strikingly, Dr. Williamson’s group reported that a version of a gene called DAB1 had become universal in Chinese but not in other populations. DAB1 is involved in organizing the layers of cells in the cerebral cortex, the site of higher cognitive functions.
I previously blogged about Dr. Bruce Lahn's research. Reading between the lines, Dr. Lahn's research shows that blacks are less intelligent than whites, and that's why Dr. Lahn had to discontinue that line of research in favor of other projects without politically incorrect findings.
It would be interesting to give IQ tests to people who are part Chinese, and see if those who have the DAB1 gene mentioned in the quote above have higher IQ than those who don't.