We see height highly correlated to genetics, but only in places without widespread childhood food instability…

All kids getting proper nutrition and calories means they reach the max height they have DNA for.

So it’s hard to compare to IQ in places where public education is shitty.

If kids aren’t living up to their potential due to poor schooling, then it’s going to look like there isn’t a genetic component.

Like, identical twins where one grew up in luxury while another grew up in abject poverty will not be the same height.

Here’s an actual academic study that goes in depth on it:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270739/

Tldr for the article (but it’s worth the read):

There’s lots of genes that effect intelligence, so rather than try to look at them individually like the article does, you need to look at a genome wide polygenic score

But a lot of the misunderstanding in OPs article is treat “IQ” as a single score. It’s like SATs, people say the average of a bunch of small tests rather than list all of them. Two people with 120 IQs could be good at very different things.

So while it may be hard to correlate certain genes with an IQ score, it isn’t to correlate a gene with a specific part of the IQ test like processing speed, associative memory, or fluid intelligence.

Comparing it to height just shows a complete misunderstanding of what IQ even is…