The skulls thing was popular so here.
So what is going on? Perhaps the derived Microcephalin allele helps us on a mental task that IQ tests fail to measure. Or perhaps it boosts intelligence in some indirect way that shows up in differences between populations but not in differences between individuals.
What would the term for that be?
The second explanation is the one favored in a recent study byWoodley et al. (2014). The authors found a high correlation (r = 0.79) between the incidence of this allele and a population’s estimated mean IQ, using a sample of 59 populations from throughout the world.
They also found a correlation with a lower incidence of infectious diseases, as measured by DALY (disability adjusted life years). They go on to argue that this allele may improve the body’s immune response to viral infections, thus enabling humans to survive in larger communities, which in turn would have selected for increased intelligence:
Hello, Mutation Load!
Come on down!
And since the brain has been proven part of the immune system since, the theory holds.
The Ice Age hypothesis in A Troublesome Inheritance appears to hold weight, the notion of tribal bonding. Altruism is only pathological if its exertion harms your genetic kin, your ingroup.
There are plenty of HBD blogs, people. Read!
Genetics? In science? What is this witchcraft! Both medical studies and hips don’t lie. https://medicalxpress.com/news/2017-11-african-american-women-diabetes-higher-er-neg.html
Turns out Africans in particular have terrible health out of the environment they evolved for.
Maybe racism has just been migration this entire time.
If you judge a fish by its ability to climb a tree…