New analysis provides fuller picture of human expansion from Africa.” October 22nd, 2012.
Excerpt with my emphasis: “…geneticists have found that genes for lactose intolerance and gluten sensitivity began to emerge in populations expanding into Europe around 10,000 years ago.
The anthropological record helps explain this: It was around this time that humans embraced agriculture, including milk and wheat production. The populations that prospered – and thus those who survived to pass on these mutations – were those who embraced these unnatural food sources. This, said Feldman, is an example of how human movements drove a new form of natural selection.”
My comment: Again, the concept that is extended is the epigenetic tweaking of immense gene networks in superorganisms that solve problems through the exchange and the selective cancellation and modification of signals. It is clear how an environmental drive probably evolved from that of food ingestion to socialization and speciation with geographical correlates. “It is also clear that, in mammals, food odors and pheromones cause changes in hormones such as LH, which has developmental affects on sexual behavior in nutrient-dependent, reproductively fit individuals across species of vertebrates.” — Kohl (2012). That’s why I concluded that “”Olfaction and odor receptors provide a clear evolutionary trail that can be followed from unicellular organisms to insects to humans.”
It’s interesting to see Feldman indicate that “human movements drove a new form of natural selection” as if there was ever any other form of natural selection that had been detailed across species by anyone else. Perhaps he means that the new form is new to evolutionary theorists who have not yet grasped the importance of understanding the basic principles of biology and levels of biological organization required to epigenetically link sensory input directly to behavior, as I have detailed for food odors and pheromones.