Steven Pinkers the "blank slate" deals with this question in depth. From what I recall is that genes do determine a lot. Evidence for this are studies with twin

Steven Pinkers the "blank slate" deals with this question in depth. From what I recall is that genes do determine a lot. Evidence for this are studies with twins that grow up separate. The crux however is that only because genes shape a lot of your behavior, that dosent mean they force you. You are not a marionette of you genes, you still have free will. There was also an interesting study where the correlation in behavior between parents and children weakens the older the children become. Meaning there is almost no nurture influence left if your 30. There was a lot more interesting stuff in the book but I dont remember it. I really recommend it though.