re: #255 Flame Fin Tomini Tang
Actually, the “bottleneck” (if one can call it that) is primarily out of Africa.
There is more genetic diversity within Africans in Africa than there is in others who left Africa 70 thousand years ago or so, presumably because that started with a much smaller genetic sampling.
“The Toba catastrophe theory suggests that a bottleneck of the human population occurred c. 70,000 years ago, proposing that the human population was reduced to perhaps 15,000 individuals[3] when the Toba supervolcano in Indonesia erupted and triggered a major environmental change. The theory is based on geological evidences of sudden climate change and on coalescence evidences of some genes (including mitochondrial DNA, Y-chromosome and some nuclear genes)[4] and the relatively low level of genetic variation with humans.[3]”