I ain’t no fancy schmancy geneticist, but that appears to be what this article is saying.
The researchers did not find any individual protein-altering SNPs that met strict criteria for differences between the high-intelligence group and the control group. However, for SNPs that showed some difference between the groups, the rare allele was less frequently observed in the high intelligence group. This observation is consistent with research indicating that rare functional alleles are more often detrimental than beneficial to intelligence.
Professor Robert Plomin from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at King’s College London, said: ‘Rare functional alleles do not account for much on their own but in combination, their impact is significant.
‘Our research shows that there are not genes for genius. However, to have super-high intelligence you need to have many of the positive alleles and importantly few of the negative rare effects, such as the rare functional alleles identified in our study.’
So basically, we (whites) would all have the 170 IQs of the early Cro Magnon man who kicked off the agricultural revolution, except that the structure of the society that resulted from Cro Magnon instincts guaranteed a great deal of mutation accumulation, and we’ve lost about 500 cc’s of average brain volume since then.
It’s only the rare birds who win the lottery by failing to have/express these mutations (perhaps partially by anti-dysgenic breeding) who have 170 IQs now. That’s why, as expected, the white intelligence distribution adheres to a bell curve with leftward skew (and a fat right tail). The right tail is a combination of random lottery winners and the group holdouts who haven’t succumbed to dysgenia quite so profoundly as their distant cousins.
Think of it like money. If your parents are rich, you’re probably going to be in the same ballpark, maybe a little higher or lower, but some people win the genetic lottery (like Oprah, an uber-melon/SC freak of nature). On the whole though, we’re getting slightly poorer each year, per capita.