Adding on to this with regards to IQ in particular, I recommend this article and it’s followup by academic intelligence researchers debunking misconceptions about their field. To sum up some of their points:
IQ test scores are significantly affected by socio-economic and other environmental factors, to the point where one study found adoption from a poor family to a rich one causes a 12-18 point jump in IQ score.
The average IQ of the whole populace jumped 18 points in 50 years due to the Flynn effect.
The gap in test scores between races has been dropping for decades, including a 5 point drop in the IQ test score gap over 30 years.
With the above points in mind, the remaining IQ test score gap of 9.5 points does not seem particularly large, and does not seem to require any genetic explanation.
Adding on to this with regards to IQ in particular, I recommend this article and it’s followup by academic intelligence researchers debunking misconceptions about their field. To sum up some of their points:
IQ test scores are significantly affected by socio-economic and other environmental factors, to the point where one study found adoption from a poor family to a rich one causes a 12-18 point jump in IQ score.
The average IQ of the whole populace jumped 18 points in 50 years due to the Flynn effect.
The gap in test scores between races has been dropping for decades, including a 5 point drop in the IQ test score gap over 30 years.
With the above points in mind, the remaining IQ test score gap of 9.5 points does not seem particularly large, and does not seem to require any genetic explanation.