The Mysterious Population That Gave Humans a 20% Genetic Upgrade

One of the most startling insights from recent genetic modeling is that the ancestors of modern humans did not evolve from a single population at all. Instead, our lineage appears to be the product of at least two deeply divergent populations that split roughly 1.5 million years ago and then merged again around 300,000 years ago. The genetic imprint of that reunion remains unmistakable today.

SOURCE:
A structured coalescent model reveals deep ancestral structure shared by all modern humans
https://www.nature.com/articles/s4158...