Stefan MolyneuxVerified account

The only 'cultural element' I can think of that has a heavy influence on IQ is cousin marriage.

Valid questions, but I can't find your argument in your sources. I think Stef's reasoning is that average IQ shapes what cultures people create. IQ being largely hereditary connects race to IQ, making it a chain of Race-IQ-Culture, even if cultures can influence and be adopted.

I think the problem is in assuming that because there is a hereditary component to IQ, that means IQ is tied to race. IQ increased substantially across many white ethnicities as the assimilated. Much of Northern Europeans culture also wasn’t indigenous but adopted.

Race is hereditary too - that's what makes races... Race is an extended family, and what runs in the family is simply there by heritage - height, color, IQ, etc. But two short persons may sometimes produce a tall child, perhaps starting off a new family tree of tall(er) persons.

Essentially all cultures are adopted, but what parts, from where and how much? If IQ is 70-80% genetic, environmental factors (like culture) are still responsible for at least 20-30% under ideal circumstances, but likely much more since so many factors can stunt IQ development.