Thesis topic?

I have to settle on a thesis topic next week and I still am not sure what to do. However, there is one subject that seems to interest me deeply. This is the boundary between ethics and evolution.

As a scientist at heart, I am greatly convinced by the processes of evolution. Echoing a sentiment I read somewhere, I am convinced that this surely has some significance on our lives as human beings. Can it be that our ethical notions are shaped somehow by some naturalistic process, rather than being totally relative as some people think?

The field of ethical philosophy is certainly complex, and the easy way out is just to proclaim dogmatically that God instituted ethics and whatever God (or the bible, or the Church) says is right means its right. I think that it is more sophisticated than that. Even the Church alludes to our conscience being our internal compass to good and evil. Everyone, even without access to a religion, can tell what is right and wrong. Is it possible, just possible, that our 'conscience' has something to do with our physiology?

To leave you with a thought, we think helping one another (altruism) is right because altruism allows a species to survive and procreate better. Murder is wrong because murderers threaten the species and tend to be eliminated from the gene pool.