In message <95195.231746U58563 at uicvm.uic.edu> - <U58563 at uicvm.uic.edu> writes:
:> Which leads me to the question: *IS* his claim that there is a major
:>difference in the degree of genetic variability actually correct? Or was he
:>giving some more half-truths or outright inaccurate information?
There is more genetic diversity in African populations at the mtDNA locus
(which is probably what he is talking about) and at short repeat loci, but not
with other systems like classical protein and blood group markers nor with the
nuclear RFLP polymorphisms. Gould is probably talking about the mtDNA
differences since they have been in the press a lot.
There is also more African diversity in some nuclear sequences and in
The pattern seems to be that humans used to be a really small species, then
we grew and are large. African ancestors exploded earlier, and so mutations
have been accumulating longer in the larger population. Thus there is
greater African diversity at systems with high mutation rates, but no greater
African diversity at low mutation rate systems where the diversity is
ancient, having passed through the "bottleneck" in human history.
I really doubt that any of this has anything at all to do with the IQ
controversy but maybe I am missing something.
Henry Harpending, Penn State University