https://en.wikipedia.org/wiki/Big_Five_personality_traits#Heritability https://en.wikipedia.org/wiki/Big_Five_personality_traits#He... Agreeableness is only 42

https://en.wikipedia.org/wiki/Big_Five_personality_traits#Heritability https://en.wikipedia.org/wiki/Big_Five_personality_traits#He... Agreeableness is only 42% heritable (the least of the Big 5), and the relative impact of the genetic component decreases if you make a deliberate effort to change your agreeableness, or are incentivized to do so by your environment.