Paul Eres ([info]rinku) wrote,
@ 2006-11-23 17:44:00
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Entry tags:history, science

A simple theory of how genetic intelligence could work.
(17:16:52) Paul Eres: also, a study was published recently that showed
(17:16:58) Paul Eres: that humans are not 99.9% identically genetically
(17:17:03) Paul Eres: that we have vast genetic variance
(17:17:26) Paul Eres: we vary quite a bit in how many copies of different genes they have
(17:17:35) Paul Eres: and that many of our traits
(17:17:38) Paul Eres: may have more to do with
(17:17:43) Paul Eres: the number of copies of a gene we have
(17:17:47) Paul Eres: than whether we have that gene at all
(17:18:00) Paul Eres: if you have 5 copies of a gene, it's actually 'expressed' more, meaning
(17:18:09) Paul Eres: more of that protein will exist in the body
(17:18:15) Paul Eres: since each gene codes for a protein

(17:18:51) Paul Eres: so intelligence being genetic could be as simple as the number of intelligence-promoting genes a person has copies of
(17:29:01) Paul Eres: our differences are more differences of number of copies of genes
(17:29:17) Paul Eres: the 99.9% genetically identical thing
(17:29:24) Paul Eres: only means that we share 99.9% of our genes
(17:29:30) Paul Eres: not that we share the exact number of copies of each

(17:34:38) iamthevoid242: Generating intelligence logically cannot be controlled by something that stupid
(17:34:48) Paul Eres: it's not stupid
(17:35:12) Paul Eres: it's not 'generating' per se
(17:35:33) Paul Eres: there are many possible ways this could be done
(17:35:35) Paul Eres: a simple one is
(17:35:50) Paul Eres: imagine if in the past when conceptuality first evolved we were much more intelligent
(17:36:15) Paul Eres: but it was found that we survive better by making some members of a tribe less intelligent
(17:36:19) Paul Eres: leaving intelligence as rare
(17:36:31) Paul Eres: there would then be evolutionary selection toward that arrangement
(17:36:47) Paul Eres: the tribes that had that arrangement conquered the other tribes and populated the world
(17:37:20) Paul Eres: now imagine if there is a gene that reduces intelligence
(17:37:30) Paul Eres: the very smartest people would have only 1 or 2 copies of that
(17:37:35) Paul Eres: with others getting 5, 10, 50
(17:38:00) Paul Eres: each copy releases a protein which increases mental dullness
(17:38:08) Paul Eres: by making the brain work less effectively in some way



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[info]haggard
2006-11-24 06:31 am UTC (link)
I can agree that the world is not currently designed to house a human population made up entirely of geniuses.

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[info]rinku
2006-11-24 06:51 am UTC (link)
It's just the way it went, it's not a matter of design. Humans happened to have evolved with large differences in intelligence just like canaries happened to have evolved to be yellow, so I don't think there's anything bad or good about it, just like there's nothing bad or good about oxygen.

Besides the tribe warfare impetus, there was probably also the more normal impetus that people who are *too* intelligent (such as people even smarter than me, like William James Sidis and the like) are less interested in their survival or in procreation, so their genetics don't continue on. What gets selected for is anything which causes a person to have more children, because everyone who's alive is descended from someone who had children and not from those who didn't.

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