Would Rose dismiss my claim that blacks are more genetically superior in the 100 meter dash? Would you SF1900? Is there a white man that can run faster than Usain Bolt? Is it because of his cultural background that USAIN is faster than any white man? Or because of his genetics?
Is a cheetah faster than a lion because of genetics or is there another reason? Does genetics not exist?
A cheetah is an entirely different species to a lion, of course genetics plays a part here. Its like saying does a bird fly instead of swim because of genetics. OF course it does!
However the issue of intelligence between Africans and other ethnic groups is entirely different. Firstly, we are all variations of the same species. One could make the argument of splitting the human species into distinct sub-species but that is not the point. There is no "gene" or group of "genes" that determines intelligence. Intelligence is a product of genetics in combination with specific rearing and learning behaviours and cultural background.
It is very difficult to develop a deep understanding of quantum mechanics when you don't have access to clean water or food and are suffering from malaria or are in the middle of a bloody civil war or a drought. Have some common sense.