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Science Forum Index » Bio Evolution Forum » A question about human genetic diversity in Africa
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| blank31416 |
 Posted: Tue Apr 01, 2008 11:07 am |
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I just read somewhere that the genetic diversity of people in Africa
is much higher than that of people in other parts of the world. The
explanation given is that small bands of people left Africa and
populated the rest of the world. Those small bands represent genetic
"bottlenecks." As populations increased outside of Africa, they
started from these small groups of closely related people. In the time
since the migration out of Africa started, there has not been time for
genetic diversity to be reestablished.
Sounds plausible. Is it true? |
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| Guy A Hoelzer |
| Posted: Wed Apr 02, 2008 8:01 am |
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African populations do have more genetic diversity than the rest of the
human species combined, and the explanation you cite is almost certainly
true.
Guy Hoelzer
in article fsu86o$23g$1@darwin.ediacara.org, blank31416 at
tpclark25@verizon.net wrote on 4/1/08 2:07 PM:
Quote: I just read somewhere that the genetic diversity of people in Africa
is much higher than that of people in other parts of the world. The
explanation given is that small bands of people left Africa and
populated the rest of the world. Those small bands represent genetic
"bottlenecks." As populations increased outside of Africa, they
started from these small groups of closely related people. In the time
since the migration out of Africa started, there has not been time for
genetic diversity to be reestablished.
Sounds plausible. Is it true?
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| J.A.Legris |
| Posted: Wed Apr 02, 2008 8:01 am |
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On Apr 1, 5:07 pm, blank31416 <tpclar...@verizon.net> wrote:
Quote: I just read somewhere that the genetic diversity of people in Africa
is much higher than that of people in other parts of the world. The
explanation given is that small bands of people left Africa and
populated the rest of the world. Those small bands represent genetic
"bottlenecks." As populations increased outside of Africa, they
started from these small groups of closely related people. In the time
since the migration out of Africa started, there has not been time for
genetic diversity to be reestablished.
Sounds plausible. Is it true?
There's some pretty good evidence for it, For example,
Stead, J. and A. Jeffreys. Structural Analysis of Insulin
Minisatellite Alleles Reveals Unusually Large Differences in Diversity
between Africans and Non-Africans. Am J Hum Genet. 71(6): 1273-1284.
Published online at:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=378563
Have a look at Figure 3:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=378563&rendertype=figure&id=FG3
--
Joe |
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