The concept of tracing human migration through the male Y chromosome is a useful one, but i read a similiar article in Discover magazine that tries to cap human presence at 20,000 years ago, because that’s what the genes say. The stock split from Central Asia no further back than that. Odd that they try to use that as proof, yet can see that a single man, presumably Genghis Khan, can spread his genes all through Eurasia 1,000 years ago. If a single man can pull that off, wouldn’t this Central Asia gene that arrives in the New World 20,000 years ago only the result of a very successful migration wave reproducing very quickly? I missed any mention the possibility of any other lines of Y-chromosomes in the New World in either article.
The article says, “The most recent common ancestor of all extant Y- chromosomes lived in Africa between 50,000 and 150,000 years ago,” but then follow the line with, “It is likely that there were many more humans alive at this time. That he is our most recent common ancestor simply implies that all other Y-lineages have since become extinct.”