I've never known anyone who ever claimed there was a 100% genetic explanation. In contrast, I've encountered many people who claim IQ differences are 100% accounted for by "environment" or "culture". No doubt it's a mix of factors, with genetics being one. But then, culture and IQ are intertwined. For thousands of years, Europeans, East Asians, Sub-Saharan Africans, and the peoples of the New World lived in isolation from one another. They created different cultures, and the ones created by Europeans and East Asians pretty much correlate with their present performance on entrance exams and IQ tests.
Was what I was replying to. He seems to think it is 100% heritable rather than 40% or so.
So you really think Europeans had more cultural factors that favored the reproductive success of intelligent people for longer than Persians? Do you think someone of Greek ancestry would be more likely to have a higher IQ than someone of Norwegian ancestry, due to the differences in culture over time?