[cstreit]

I'd suspect their are some traits that are genetic... Though none of these are 100% I'm sure nor are they necessarily carried through, but things like mental accuity, temper, emotional response, etc... I could see being somewhat genetically predisposed. That said I also believe that we are masters of our own behavior and that your environment and upbringing has more to do with it than anyone else.

No studies but we've all known that person that was entirely different after seeing them 15 years later, the kid who had that "bad phase" and children who couldn't be any different from their parents...