There are some new studies in the last few years that I had not seen. The prevailing hypothesis on Native American origins seems to change every few months and the mitochondrial DNA experts, y-DNA experts and archeologists always disagree.
But there seems to be a new hypothesis that I'm having trouble wrapping my head around. It proposes that a genetically-homogeneous proto-Native American population became culturally isolated 20,000 years ago and refused to intermarry for 20,000 years until the two skull shapes, long vs round/wide finally appeared in the two subpopulations. Both moved into the Americas and continued to mate only within their own groups and, over time, the longheads mostly died out.
It explains the observations but it seems so far-fetched. On the other hand, I once read a paper once about two ancient South American villages only about 2km apart and all the graves in each village were a single mtDNA type and different from the other village. I need to do some more reading this. Its hard to buy. This would require some sort of pervasive cultural apartheid.
Edited 2 time(s). Last edit at 16-Jul-19 20:29 by AndyBlackard.