[85IbLcwQ]

Ok -- since this topic often comes up -- I did a systematic (and in my view relatively balanced) review of the genetic hypothesis -- at least as it concerns the US.

I think we can conclude the following:

1) In the US, there are average differences in general intelligence between socially classified races; and these are causally significant and substantially biological (which doesn't imply genetic).

2) Globally, there are average differences in general intelligence between some geographic populations; and these are causally significant and substantially biological (which doesn't imply genetic).

3) There is a rough correspondence between the US average racial differences and the global differences. But there are numerous exceptions and many of the new international adoption studies don't cohere with a global hereditarian hypothesis.

4) Overall, with regards to significant average between ancestral population differences in genotypic g, the evidence is equivocal.

5) The above summarizes most of the evidence up to 2010 -- except for a few meta-analyses on international adoptions which I have yet to go through. (The data isn't exactly being presented in a straightforward manner).

6) At the current rate of research on this matter, this question will be resolved well after the relevant genetic engineering comes on line.

7) On the other hand, research on less controversial but equally neat (average) population differences in behavior is jugging along.