I know it can be a hot topic. I have long wondered what the real isolation timelines were for East Asia, India, Africa, and Europe. I’m most curious about the first two as they seem so divergent. Like a group had to be mobile enough to relocate, but then stay within a region for a (?) long time with little influx.
It is a shame that this seems to be such a loaded topic. Hopefully I have framed the question with something of a social filter. I am not interested in the sociopolitical or pseudo science nonsense.
Studies of gene flow are probably more what you’re looking for, rather than phenotype. I’m 10 minutes from heading out the door so I don’t have time go hunting for links, but if you search for information about haplogroups, molecular clocks, and mitochondrial DNA you’ll be able to find a lot of information about the history of gene flow in humans.