There's a paper I can't find at the moment that looks at almost 4000 non-related people, give them an IQ test each + scan their DNA for typical SNPs with a DNA chip. That gives us almost 8,000,000 pairs where we know how similar their IQ score and DNA was. That gives us almost 8,000,000 points we can plot into a 2D coordinate system (and we can of course also throw statistics at them). It turns out that there is a clear correlation between measured IQ and measured SNPs (i.e., the point cloud is denser along a line). In other words, there is a statistical relation between DNA and IQ.
As always, correlation does not imply causation. Since clearly nurture has a very strong effect on IQ, unless you control for the background of these subjects, I don't think it means anything. It's clear that for a random sample of people in the world today, there will be a clear correlation between race and background.
> Since clearly nurture has a very strong effect on IQ
It actually hasn't, however clear it might be to you.
(Well, it does have on childhood measurements of IQ but then it tapers off to practically nothing. Adopted children end up with adult IQs similar to that of their biological parents, not to that of their adopted parents.)
As always, correlation does not imply causation. Since clearly nurture has a very strong effect on IQ, unless you control for the background of these subjects, I don't think it means anything. It's clear that for a random sample of people in the world today, there will be a clear correlation between race and background.