Had ever been found a specific gene related to a specific instinct or part of it?
My limited understanding of genetics would suggest that the idea that there is a 'gene for x behaviour' or a 'gene for y trait' is erroneous thinking, possibly fueled by journalistic reporting of genetic studies which merely indicate that certain genes may be involved in some way with said traits.
But I would say that I think studies in mice and other similar animals have shown that instinctive traits such as 'aggression' have a genetic component, but I don't know the details. I guess you could look them up with a bit of searching around if you are genuinely interested.
I do seem to remember that when scientists domesticated foxes, making them less aggressive this had an impact to their coat colour because coat colour was on the same developmental pathway as adrenaline or something along those lines. This was thought to be genetic.
I'd hunt around for something more specific, but since it isn't really the topic of this thread, I don't feel compelled to throw this thread in an off topic direction for you.
Edited by Modulous, : No reason given.