Genetic clocks show they split from populations alive in East Asia today between 45,000 and 75,000 years ago.
These two reports (Grossman et al., 2013; Kamberov et al., 2013) tell a new short story of adaptive evolution. The story begins with what was probably a nutrient-dependent variant allele that arose in central China approximately 30,000 years ago. The effect of the allele is adaptive and it is manifested in the context of an effect on sweat, skin, hair, and teeth. In other mammals, like the mouse, the effect on sweat, skin, hair, and teeth is due to an epigenetic effect of nutrients on hormones responsible for the tweaking of immense gene networks that metabolize nutrients to pheromones. The pheromones control the nutrient-dependent hormone-dependent organization and activation of reproductive sexual behavior in mammals such as mice and humans, but also in invertebrates as previously indicated. That means the adaptive evolution of the human population, which is detailed in these two reports, is also likely to be nutrient-dependent and pheromone-controlled, since there is no other model for that.
My comment: Genetic clocks link RNA-mediated amino acid substitutions to cell type differentiation in all genera via metabolic networks and genetic networks. The networks of populations are nutrient-dependent and the networks diverge due to ecological variation, which requires ecological adaptations via fixation of amino acid substitutions.
Only the claims of how long it takes for one amino acid substitution to differentiate the cell types of a specific human population are questionable. When compared to the experimental evidence that showed the bacterial flagellum could “re-evolve” over-the-weekend, all claims of evolutionary theorists seem equally ridiculous. Attempts to re-write the history of any modern human population based on ridiculous theories are futile. Facts about how the epigenetic landscape is linked to the physical landscape of DNA in the organized genomes of all species are readily available. The facts continue to be updated, and no re-writes are required to link biologically-based cause and effect to differences in populations of species from microbes to humans.
See also: Nutrition an issue for Indigenous Australians
Nutrition contributes to many indicators of wellbeing, including maternal health, birthweight, child development and oral health.