What's "highly"? It's likely somewhere between 15%-50% --- weak-to-medium, if you read it as a correlation coefficient.
IQ is about as heritable as body height.
> The results show that the heritability of IQ reaches an asymptote at about 0.80 at 18–20 years of age and continuing at that level well into adulthood.
https://www.cambridge.org/core/journals/twin-research-and-hu...
alt Hacker News
IQ is about as heritable as body height.
> The results show that the heritability of IQ reaches an asymptote at about 0.80 at 18–20 years of age and continuing at that level well into adulthood.
https://www.cambridge.org/core/journals/twin-research-and-hu...