Ok granted I am coming from the opposite side and I apologize if this is unwelcome here.

Who really knows if it is born or learned. I loved the dom side of things since I can remember but in real life I am very laid back and don't have to be the leader all the time. Although my uncle once said I had a daddy complex and always had to be in charge. Hmm, I had forgotten that. Well I guess I am pretty laid back as long as I get my way. I don't bully people, but I always stood up to the bullies, got beat up a few times but they didn't pick on me for long or anyone I was around. I don't have to be Steve Jobs, I can work for him just fine but then again don't try to micro manage me, leave me alone and I will get the work done. I can't say there is a dominant gene or a submissive gene but I do suspect there are combinations that lead a person to be not submissive or not dominant.

just my .$02 worth