[annyeonghada]

>can be

Yes, "can". Because we are not clones of our parents. It doesn't mean that conscientiousness hasn't something like 60-80%of hereditability.

[_blu]

again, that's not true. It can be argued that it can't be proven beyong 50%, which means that it's a toss-up and parents with low conscientiousness have children with high scores. Also, this trait is not indicative to success, even if it correlates. Too high is also a negative, just as too low is.

[pseudalopex]

Studies say 20-70% for different measures.