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sci.bio.evolution |
>> Dangers of too much inbreeding include the problems you mentioned.
>> Dangers of too much outbreeding include half breeds, mule effects
>> and incompatible gene complexes - effects which have most likely
>> contributed to the stigma historically associated with such
>> unions - e.g. see: http://en.wikipedia.org/wiki/Miscegenation
> I doubt you would have stated this without researching it first. As far
> as human engaging in interracial mating I think everyone is aware of
> the term "half-breed". I'm also aware at times throughout history
> "half-breeds" have had a hard social time being accepted and fitting
> in. I'm not aware of human "half-breeds" having mule like effects and
> incompatible gene complexes. Can you provide evidence of signifigant
> mule effects and incompatible gene complexes among humans who
> interracially mate? In short, evidence biological abnormalities are
> more prevalent in this special population than the average population.
``And there is a downside to intermarriage.
The obverse of hybrid vigor: the possibility that combining
genes which didn't evolve to work together might cause
health problems due to incompatibilities.
For example, ace genetics reporter Nicholas Wade wrote in
the New York Times ( 11/11/05) about a gene variant that is
benign in whites and Asians but more than triples the heart
attack risk in part-white African-Americans:
"Dr. Stefansson [of Iceland's DeCode Genetics] said he
believed that the more active version of this gene might
have risen to prominence in Europeans and Asians because
it conferred extra protection against infectious
disease.
"Along with the protection would have come a higher risk
of heart attack because plaques that build up in the
walls of the arteries could become inflamed and rupture.
But because the active version of the gene started to be
favored long ago, Europeans and Asians have had time to
develop genetic changes that offset the extra risk of
heart attack.
"The active version of the inflammatory gene would have
passed from Europeans into African-Americans only a few
generations ago, too short a time for development of
genes that protect against heart attack, Dr. Stefansson
suggested."
[Genetic Find Stirs Debate on Race-Based Medicine]
Like hybrid vigor, genetic incompatibilities across racial
lines unquestionably exist in some cases. So the key
empirical question is: what the net balance of the two
opposing forces?''
- http://www.vdare.com/sailer/060904_interracial.htm
My guess is that one of the parental fears behind the
common disapproval of interracial marriages, is the
concern that any offspring will not fit well into
either family's social group - due to not being
perceived as being a full relative as a result
of differing racial markers.
--
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