Ancient Skeletons In Brazil Carried A Genetic Signal Scientists Did Not Expect — And It Complicated The Story Of The First Americans
And it was found in multiple analyses by different research teams using different datasets, which made it difficult to dismiss as an artifact of any single study.
This is the Population Y signal.
It is not a finding that Australians reached South America.
It is a finding that certain South American populations share more alleles with Australasian populations than would be expected if both groups had simply descended independently from a common ancestral pool without any additional contact or shared ancestry.
The question — and it is a genuinely hard question — is what caused that excess sharing.
The 2015 Study That Named the Problem
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