Uhm...
I'd say < 0.1%, considering that almost no other sets of genes (aka "people") seems bent on controlling the expansion of the human population, and I don't suppose my genes are somewhat special. Plus, that would imply that genes 'care' somehow about the group of humans as a whole, which they definitely don't.
Although the extent to which my genes determine the shape of my mind is an interesting angle. Not enough cogent to revert my original point, since it's clear that who I am today is also the result of > 30 years of experiences and cognition, but it's an interesting point to consider: should I value more people who are more like me?
I don't have an answer at the moment.
"Your genes are responsible for X" is ambiguous because that statement may or may not imply a certain amount of directness. My genes are responsible for the fact that I have a driver's license, in the sense that if I had the genes of a wombat, I wouldn't have a driver's license, but that's not what most people would mean by that.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.