Not just intelligence - all of the Big Five personality traits are 40-60% heritable: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5068715/ https://www.ncbi.nlm.

Not just intelligence - all of the Big Five personality traits are 40-60% heritable: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5068715/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5068715/ > That means about 95 percent of the intelligence differences in these samples, at least as measured in this manner, did not come down to the genes the researchers examined, which leaves plenty of room for those concerned with environmental influences. This is misleading. Those specific genes account for 5% of the difference, but the consensus is that, for IQ (which is not a perfect measure of intelligence), heritability (i.e. influence of all genes) is 57-80%: https://en.wikipedia.org/wiki/Heritability_of_IQ https://en.wikipedia.org/wiki/Heritability_of_IQ