Entrepreneuship is not a really "calculated risk", its a deeply uncalculated one on the contrary: leave your job (or your normal career track), get no revenues for an undefined while, bet most of your credibility on idea that may change or become irrelevant, etc...
Teachers can tell stories about all of those, but they won't really "teach" them, since there are too personnal to be replicated.
#2 is interesting: both the thesis and the antitheses are wrong! There can hardly be an "entrepreneur gene", but at the same time, what makes an entrepreneur is its ability to break rules, and breaking rules can't be taught.
I followed a couple of courses about entrepreneurship in a top B-school - not too many, though - and I am quite sure none of them turned corporate exec, engineers, consultants or lawyers into entrepreneurs if they were not ready for it in the first place.