Genetic variation among African Americans  By Razib Khan | May
5, 2010 10:43 am  There’s new paper in Genome Biology (tip:
Dienekes) which doesn’t present too much in terms of new
results, Characterizing the admixed African ancestry of African
Americans, but has really, really, good visualization of the
data:    I want to emphasize the part about lack of utility of
uniparental markers. These were the first markers which became
widely used in scientific genealogy, and African Americans made
a great deal of recourse to these so as to identify the tribe
from which their ancestors came. There are obvious historical
reasons why this would have more valence for this group than for
others, as their ancestral identity was consciously erased
during the period of slavery.  But even though generating trees
of mtDNA or Y markers is more tractable using a coalescent
model, and it gives you a clean answer, it’s only a tiny slice
of your ancestry. And not necessarily a representative one.
Perhaps better than nothing 10 year