/sci/ - Science & Math

>>16146399
>most genes that vary within humans have fuck all to do with "race".
That's not quite true, because "most of the information that distinguishes populations is hidden in the correlation structure of the data".

For example, allele A of gene B is present in both population 1 and population 2. But 90% of the individuals of pop1 have it, while only 10% of pop2.
That gene has something to do with race even though it's present in both races.

>>15817306
>the category of "negroid" included aboriginals
This poster from 1911 separates them

>>9050835

Because anthropologists and population geneticists fear the politically correct thought police, they use synonyms for the word race. These synonyms include: ancestry, cluster, population, statistical collections of alleles, cline, clinal grouping, lineage, and regional pattern.

The size of the Negroid brain is significantly lower in volume than the Mongoloid or Caucasoid brain. The size of its frontal lobes are small and uncomplex, and the brain as a whole shows an unimpressive, moderate degree of fissuring (Lynn, 2006a, pp. 210-211; Rushton, 2000a, pp. 130, 133).

Converting brain volume into the number of neurons, Mongoloids average more than half a billion more neurons than Negroids (Rushton, 2000a, p. 133; Broom, 1918, p. 63-79; Howells, 1948, p. 118; Galloway, 2005, pp 31-47). East Asians (Han Chinese, Koreans, and Japanese) have the highest ratio of brain to body mass, but the record for brain size goes to Russian writer Ivan Turgenev, at 2012 gms (Corballis, 1991, p. 66). The heritability of brain size is about 0.9 (Lynn, 2006a, p. 67).

The ridges (gyri) between the groves (sulci) at the surface of the brain greatly increase the surface area of the cerebral cortex, the outer layer of the cerebrum. Since the cerebral cortex processes information, increased brain fissures increases the percentage of the brain that is cerebral cortex and should increase intelligence without increasing the volume of the brain, although this is difficult to establish quantitatively (Baker, 1974, p. 432). Negroids and some retarded people have fewer convolutions (fissures) in the cerebral cortex of their brains, where abstract thought is performed (Broca, 1858, cited by Rushton, 2000a, p. 106).