Comment Re:Intercourse. (Score 1) 103
For the moment, I think we need to point to the simplest hypothesis, which is these genes were present in at least of the proto-Indian populations that went over the land bridge. That's not to exclude the possibility of new evidence pointing towards some sort of trans-Pacific input into the Americas, but the evidence, as small a body as it is, simply does not support that conclusion. More studies will be needed to determine if there are other loci for these genes, in the hopes of establishing at least the rudiments of a migration pattern.