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To: allmendream
If there was no “cost” to a gene that unambiguously made people more intelligent - it would rapidly reach 100% penetrance in human populations.

Not true.

There has to be some environmental pressure which causes those people with the gene to be more successful at breeding than those without the gene. If a gene does not provide a dramatic increase in an organism's chance of breeding (or surviving to breed) then there's no reason for that gene to increase in the gene pool.

I don't see many examples of hyper-intelligence granting people increased breeding opportunities.

28 posted on 06/04/2012 9:50:20 AM PDT by whd23 (Every time a link is de-blogged an angel gets its wings.)
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To: whd23
While people do tend to mate assortively for general intelligence level - there IS a strong mate selection bias for more intelligent people - just as there is (in general) for taller people or richer people.

So in a society where intelligence was not valued - yes there would be less environmental pressure favoring greater intelligence.

But in general and in most human societies - intelligence is valued and intelligent people are favored by sexual selection - as well as general run of the mill selection - intelligence also contributing to affluence - which is also highly favored by sexual selection.

And there need not be a “dramatic increase” in reproductive success for a favored gene to reach penetrance in a population - just a minor incremental difference over many generations.

29 posted on 06/04/2012 10:03:56 AM PDT by allmendream (Tea Party did not send GOP to DC to negotiate the terms of our surrender to socialism)
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