I can't take any of this seriously so long as any research on race and intelligence continues to be banned as heresy rather than being discussed scientifically.
Or more accurately, if it were genetic the races would look very different.
The genetic diversity of "black" alone exceeds the rest of the world combined.
So you have two choices:
1. Everybody is black.
2. The other races roughly stand, but there are dozens of different black races.
Or you can be more accurate and say race is cultural.