Nature vs. Nurture

Do you believe that we are born with the behavioral traits of our parents, or it depends on how we're raised?

I'm divided on this one. My siblings and I were adopted at a very young age. We joined a great family. While I was raised by this family from the age of 9. I still have a tremendous cache of memories from my biological parents. I personally, can see I have the habits of both. All the negative from my birth parents. Pessimism, temper, prone to addiction, a tendency for violence, etc...while my positive traits are from my adoptive parents. Respect, chivalry, level headed, the will to do good, strong work ethic, etc...but how could this be? We believe that wild animals can't be tamed. Were dogs not once all feral? Are they now considered man's best friend? Can we take a pit bull and make it the most gentle creature you've ever seen? Yes, we can. So why can't we, as people, erase the traits of our fathers so to speak? How do we unlearn something? I believe that I was born, prone to do/act a certain way. It's in my blood. It's the way I'm wired. I also feel, were I not adopted it would be worse. I wouldn't have my "good" qualities. So which one is it? Is there a balance between the two? Maybe when I figure it out the negativity will vanish, or I may be able to accomplish things of grandeur. We may be able to block out, but speaking from experience you'll never escape it. Take the experiences in your life, and create the person you want to be. Don't let anything define you, but your own thoughts and actions. Don't let anyone tell you that you're supposed to be a certain person, and never use your past as a crutch. Nurture yourself to become the nature you choose.