/sci/ - Science & Math

>>12174555
Wrong. skin color is directly influenced by melanin. the common theory among race realists is that darker people are dumber (which includes southern Europeans and arabs, other dark "caucasoids" etc) and that the nordic races and north asians are the smartest. you don't even know the bullshit you are shilling

A large number of national and geographic population samples were used to test the hypothesis that the variation in mean values of skin color in the diverse populations are consistently correlated with the mean measured or estimated IQs of the various groups, as are some other physical variables, known as an ecological correlation. Straightforward statistical analyses clearly bear out the hypothesis, showing a significant positive ecological correlation between lightness of mean skin color and mean IQ across different populations. The main limitation of such a study design is that correlations obtained from this type of analysis are completely non-informative regarding any causal or functional connection between individual differences in skin pigmentation and and individual differences in IQ, nor are they informative regarding the causal basis of the correlation, e.g., simple genetic association due to cross-assortative mating for skin color and IQ versus a pleiotropic correlation in which both of the phenotypically distinct but correlated traits are manifested by one and the same gene.

>http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0080823
>A Potential Benefit of Albinism in Astyanax Cavefish: Downregulation of the oca2 Gene Increases Tyrosine and Catecholamine Levels as an Alternative to Melanin Synthesis
>Our results show significant increases in L-tyrosine, dopamine, and norepinephrine in pre-feeding larvae and adult brains of Pachón cavefish relative to surface fish
>A key finding is that knockdown of oca2 expression in surface fish embryos delays the development of pigmented melanophores and simultaneously increases L-tyrosine and dopamine
>We conclude that a potential evolutionary benefit of albinism in Astyanax cavefish may be to provide surplus L-tyrosine as a precursor for the elevated catecholamine synthesis pathway, which could be important for adaptation to the challenging cave environment

>https://www.ncbi.nlm.nih.gov/m/pubmed/24417771/
>IQ was lower in individuals with the C/C genotype than those with T carriers. The plasmid with the T allele at -824 showed higher transcriptional activity than that with the C allele in a transient transfection experiment using a luciferase gene as a reporter, implying that the T carriers may have higher TH activities and retain higher levels of catecholamines in the brain

Hypothesis: Dopamine and melanin are opposed, in that melanin is metabolized dopamine. You can't have melanin without getting rid of dopamine, and high levels of dopamine are correlated with high IQ. Therefore;

Melanin+ = Dopamine- = IQ-,
Melanin- = Dopamine+ = IQ+.

>>9426896

>>8966699
>>8966682