This is a very odd statement for a scientist, a geneticist, to make:
Despite his frantic backtracking, James Watson\’s statement that Africans are less intelligent than Europeans follows a long and dubious tradition of geneticists claiming that supposed racial differences have a genetic basis.
If racial differences do not have a genetic basis then it\’s very difficult to think what they might be based upon. Things like the preponderance of red hair in Scotland, of long distance runners in East Africa, sprinters in West, epicanthic folds in Asia: these are clearly genetic markers of what we call race.
We can argue that race isn\’t an important idea, that our common humanity (and indeed, the fact that variability within groups is almost always larger than that between group averages) means we should disregard it.
We can also argue that while some things are indeed racial differences and have a genetic basis, that the things that people think are (to be crude, dick size, or to be less so, sexual appetite, or in this case, intelligence) are in fact not.
But to claim that none of the observable differences between different groups of humans have a genetic basis is simply absurd.
BTW, on what Watson actually said, that "Africans" or "blacks" have certain genetic traits that make them less intelligent than other groups. Others have pointed out that even the measurement of intelligence, let alone its inheritability, is still somewhat controvesial…..but to me the claim fails for a very different reason.
Let us assume many of his points: that there are groupings of humans that correlate with what we think of as races, That there is some genetic determination, some traits of these groups that are inheritable. If we do assume all of that then we do not get to a situation where we can talk about "Africans". For, at least as I understand it, there is more genetic variation in Africa than there is in the rest of the world.
The Zulu, the Pygmy, the Khoi San, the Ibo, Amhara, Dinka, (add groups to taste) show more variation between them than is found in the rest of humanity put together. Thus to state that "Africans" are genetically this or that is simply nonsense.