Before revision: In Early Humans Cultural hitchhiking has been proposed as an explanation for a widely inferred and abrupt Y-chromosome population bottleneck across several Old World (Africa, Europe, Asia) populations around 4000-6000 BC .
After revision: A study in the same area and species shown that shelling is also marginally learn from URLIn Early Humans Cultural hitchhiking has been proposed as an explanation for a widely inferred and abrupt Y-chromosome population bottleneck across several Old World (Africa, Europe, Asia) populations around 4000-6000 BC .