The whole point of morality is that we go against our genetic imperatives. Our genes may tell us that we're hungry and we should eat, but morality tells us that say, we should not steal or kill animals or whatever.

It may be possible to pinpoint a part of genes that enable or disable certain moral behavior. But what's to say that the person wouldn't eventually become self-aware of that fact? He becomes aware that a part of his genes is telling him to do something. He starts to think rationally about the fact. He starts to think that the morality that his genes are telling him to have is deplorable. The fact that we have the ability to think rationally means that we can be above our genes.

So genes may tell us to have certain moral behavior. But morality is actually based on rationality. We may or may not listen to our genes. We may actively go against it.