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The bottleneck hypothesis offers an explanation for why humans exhibit so little genetic variation, yet superficially appear diverse. It also affords an explanation for the apparent recent coalescence of mtDNA and African origins.
Population Bottlenecks and Volcanic Winter
Originally posted by GradyPhilpott
Let's not get too carried away with the bottleneck hypothesis. It sounds plausible and I'm sure that there is evidence to support such, but it is hardly Gospel.
Originally posted by ironjello
I found a few links to show some studies that show that an IQ is 50% genetic and 50% cultural and also By adulthood, East Asians average 1 cubic inch more cranial capacity than Whites who average 5 cubic inches more than Blacks. LINK so we are all different and most races DO have some proven differences
BTW i am Black and asian
Originally posted by RedDragon
Brain size has very little to do with intelligence.