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beskeptigal
SFN Die Hard
USA
3834 Posts |
 Posted - 09/14/2005 : 09:04:34 [Permalink]
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quote:
Originally posted by Dr. Mabuse
...The difference is that in the developed world we have removed much of the selection pressure. That way, a larger part of the mutations occurring are neutral, as we have the ability to compensate for negative genetic mutations like hemophilia, colour-blindness, diabetes, physical deformities, various mental disabilities etc.
Changes in homo sapien sapien are now more than ever subject to genetic drift rather than natural selection.....
We haven't removed selection pressures, just manipulated them. While we keep a hemophiliac alive long enough to reproduce, that is as much a selection pressure as having them die before child bearing age. |
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Ricky
SFN Die Hard
USA
4907 Posts |
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Dr. Mabuse
Septic Fiend
Sweden
9688 Posts |
Posted - 09/14/2005 : 22:01:45 [Permalink]
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Natural selection pressure would be hemophiliacs bleeding to death before reproducing, selecting non-hemophiliacs for survival. By medicating hemohiliacs and taking care of them to live to procreate, we have eliminated (or at least greatly reduced) that particular natural selection pressure.
Now the hemophilia genetic disorder is subject to genetic drift, lingering in the genome in a way it wouldn't have only 10'000 years ago. |
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