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[OBG]The genetic correl. btwn. educational attainment, intracranial vol.

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Duxide,

We should distinguish between two things: 1) the time of origin of the derived alleles; and 2) the increase in their incidence to present levels. Since homo sapiens is a young species, selection has tended to act on existing genetic variability (as opposed to waiting for new mutations to arise). What interests me is the trajectory of these derived alleles. Did they increase in incidence over time at roughly the same rate? Or did they exist at low levels for a long time before undergoing a rapid increase much later?

I know you can't answer these questions with the current data, but would it be possible to chart this kind of trajectory by looking at adjacent stretches of DNA? This seems to be the method most commonly used. Of course, retrieval of ancient DNA would be an even better method.

Chuck,

I'm skeptical about the role of parasite load. Parasite load would have decreased dramatically once early modern humans had left the tropics and entered seasonal temperate environments where the ground is frozen for part of the year. Thus, when we look at the correlation between mean temperature and technological complexity in hunter-gatherers, we should see a sharp increase in complexity between tropical and temperate environments. But this isn't what we see. There is just a steady increase with decreasing mean temperature
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[OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Mar-24, 13:35:18
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Peter Frost - 2014-Mar-25, 14:40:36
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Mar-25, 18:17:49
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Mar-25, 15:54:16
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Peter Frost - 2014-Mar-26, 15:15:28
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Mar-26, 15:31:48
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Mar-26, 17:14:35
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Chuck - 2014-Mar-26, 23:15:14
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Mar-27, 00:53:34
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by RichardLynn - 2014-Apr-10, 19:17:36
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Apr-10, 19:39:48
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Apr-11, 08:06:04
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Apr-11, 11:02:59
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Apr-11, 13:42:40
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Apr-11, 14:01:42
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Apr-11, 14:04:56
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Duxide - 2014-Apr-11, 15:32:31
RE: [OBG]The genetic correl. btwn. educational attainment, intracranial vol. - by Emil - 2014-Apr-12, 10:29:31
 
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