I repeat, attributing more significance to observed similarities than observed differences is a social construct. One minute we're talking about fairly obvious visible differences like Korean-descended people almost invariably having paler skin and narrower eyes than Bantu-descended people. You also mentioned stature, which is rather less helpful to your thesis because there's a huge range of average heights between different Bantu subgroups and on average North Koreans are substantially shorter than their genetically difficult-to-distinguish southern cousins. Except for someone like Ri Myung-hun, who's over 7'8". Would one say his stature is best evaluated by analysis of the average height of people bearing "Korean" genetic markers or using a tape measure?
And of course, inevitably you move on to pretending that the huge and stable variation in measured test performance within a population is of lesser import than relatively small and unstable difference in average test performance between populations. Even if we grant the rather silly proposition that tests so unstable that the Dutch population improved by more than a standard deviation in thirty years are actually a good measure of innate intellectual differences unaffected by non-genetic factors, you've got the problem that it's impossible to predict with any degree of certainty what the person who took the test's genetic background actually is. I mean why would anyone interested in investigating innate intelligence choose to focus on genetic markers that predict my skin tone pretty accurately but can't even rule out the possibility of me being in the very top or very bottom percentile for results in any cognitive ability test?
> the Flynn effect changes the absolute scores, but not the difference.
I'm going to go out on a limb and suggest that if a test indicates that me and my fellow white English thirtysomethings produce average scores a standard deviation ahead of (i) thirtysomething black people living in my country and (ii) my white grandparents' generation when they were my age, what's actually measured by the observed one standard deviation average differences across cohorts probably isn't genetic differences....
And of course, inevitably you move on to pretending that the huge and stable variation in measured test performance within a population is of lesser import than relatively small and unstable difference in average test performance between populations. Even if we grant the rather silly proposition that tests so unstable that the Dutch population improved by more than a standard deviation in thirty years are actually a good measure of innate intellectual differences unaffected by non-genetic factors, you've got the problem that it's impossible to predict with any degree of certainty what the person who took the test's genetic background actually is. I mean why would anyone interested in investigating innate intelligence choose to focus on genetic markers that predict my skin tone pretty accurately but can't even rule out the possibility of me being in the very top or very bottom percentile for results in any cognitive ability test?