Psychology or genetics?

I am of the belief that genetics adapt - over the course of decades. If a person engages in certain behavior or has certain tendencies overall, then has kids, those traits are kind of ped on. I studied genetics and worked on several projects - There are structurual genetics (morphology) like the kind that fire in the womb to grow the fetus, developmental codes for controlling rates of growth and extent of growth, and maintenance codes. Much of DNA isn't USED because it's been turned off with stop markers. We all can through our choice overcome the tendencies of our programming, but few do I have found.