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New research indicates modern
man can be traced to one small group in Africa, according to professor Lynn
Jorde of the Eccles Institute of Human Genetics at the University of Utah. Jorde
told a genetics conference there is much more genetic diversity among Africans
than Europeans or Asians, a finding that could overturn theories that man developed
independently in several areas of the world.
"Once you've seen one European, you've pretty much
seen them all," Jorde told the International Society for Animal Genetics meeting
Monday. The five day meeting runs through Wednesday. Jorde said the findings
indicate Europe and Asia were colonized by Africans about 100,000 years ago.
He said at one time the species was nearly extinct, numbering fewer than 10,000.
Researchers from the Harvard School of Public Health and Louisiana State University
studied 23 pairs of human chromosomes as well as cellular DNA passed on by mothers
to their children, focusing on areas that contain strings of chemicals that
do not express themselves as genes and are therefore overlooked by natural selection.
Jorde noted that aside from skin color, there's
very little variation among humans. By contrast, there is much more genetic
variation among chimpanzees. "We are really a young species and there has not
been much time for divergence to occur," Jorde said in interviews after his
lecture. Jorde predicted that now that the human genome has been mapped, the
pace of genetic research will quicken.
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