New research; Native Americans descended from one common founding population

Listeros,

An international team of scientists have compared DNA samples from
dozens of modern day Native American and Eurasian groups. Without
exception, the new evidence supports the single ancestral population
theory.
The study is published in the May issue of the journal Molecular
Biology and Evolution.
The team found a unique variant (an allele) of a genetic marker in the
DNA of modern day Native Americans. This variant occurred in all of
the 41 populations sampled from Alaska to Chile but was absent in all
54 Eurasian, African and Oceanic groups studied.
Therefore, it appears that all modern Native Americans and
Greenlanders descend from a common founding population. The allele is
absent in other Asian populations which probably means the Native
Americans developed this variant in isolation from Asia. The
researchers took care to rule out all other possibilities including
multiple mutations. This is the first large scale study to confirm
this utilizing the DNA of both sexes.

E-Science News has the story here;
http://esciencenews.com/articles/2009/04/29/native.americans.descended.a.
single.ancestral.group.dna.study.confirms

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