I normally don’t bother getting into discussions about genetics, but George, from all my readings your posts seem to equate the few genes for skin pigmentation with all sorts of other, more important characteristics. It is an important error to assume that genes that formed in response to one enviromental stress has anything to do with other characteristics the person or group have. Melanin protects against sunlight, so one would expect it to exist in those who’s ancestry was nearer the equator. When groups moved away from the equator to colder climates, those with darker skin tended to radiate heat more efficiently, making them more susceptible to death from the cold. This seems to be a clearcut case of species change in response to an environmental change. I don’t see any reason that those who moved north would also tend to shift, genetically, to more intelligence, etc.
A good example of variation in skin pigmentation is the Japanese. Those who’ve lived in the north for many many generations have lighter yellow skin while those who have lived in the southern-most sections of the country have a rether deep beige coloration.