You are the one that made the claim that moral traits are inherited so the burden of proof is on you - it's YOUR claim. If you can't back up your claims, don't make them.
As I pointed out before, all traits are inherited, and all traits are subject to sculpting by the law of survival of the fittest. It is irrelevant whether or not, or to what degree, the implementation of these traits is through DNA. We knew about this before we knew about DNA.
That's why we have fan-tail guppies, chihuahuas, and families that produce volleyball champs generation after generation. Do you also want me to "prove" that prowess in volleyball is located in some particular gene?