A new paper recently released discusses the origins of Native American populations. Diekenes Anthropology Blog has been a great source for years now, and it looks like he may have obtained an advance copy of the paper. He does a good job of taking a look at it, so please visit his link at http://dienekes.blogspot.com/2012/07/reconstructing-origin-of-native.html
There has been a lot of discussion over the years about whether the Native people came in one group or in different groups, characterized as waves. This paper says three groups. In the past, other researchers have reached other conclusions.
It’s also quiet interesting that it doesn’t seem to be a one way street – that some Native genes are found in the Chukchi people in Russia. Since we know that the Chukchi people are the closest matches to the Native people in Alaska and western Canada, and we’ve known that for a long time, I wonder how they are measuring the backflow to Russia, and how they know it’s backflow from Native people here. I think that differentiation would be exceedingly difficult because that is the originating population.
Academic researchers and papers don’t always agree, but they are all cogs in the wheel of learning and always interesting.