One of my favourite papers discusses this (and more): > Top 10 Replicated Findings from Behavioral Genetics > 1. All psychological traits show significant and

One of my favourite papers discusses this (and more): > Top 10 Replicated Findings from Behavioral Genetics > 1. All psychological traits show significant and substantial genetic influence > 2. No traits are 100% heritable > 3. Heritability is caused by many genes of small effect > 4. Phenotypic correlations between psychological traits show significant and substantial genetic mediation > 5. The heritability of intelligence increases throughout development (from 41% (age 9) to 55% (age 12) and to 66% (age 17); "unlike the other findings, this one is limited to a specific domain") > 6. Age-to-age stability is mainly due to genetics > 7. Most measures of the ‘environment’ show significant genetic influence > 8. Most associations between environmental measures and psychological traits are significantly mediated genetically > 9. Most environmental effects are not shared by children growing up in the same family https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4739500/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4739500/