I would assume that the father displays more masculine traits which are more likely to be associated with austism disorders.
In my biological family, I have a deceased grandfather who undoubtedly had AS, a sister who definitely does, and a brother who probably does with high-functioning traits. The sister is a half-sister on my mother's side, and so (as the grandfather is maternal), it is confirmed to originate exclusively on that side.
In my adoptive family, my father (the computer scientist) and I share most traits and are, apparently, considered alike by non-familial parties.
Therefore, I conclude (with no real scientific study, mind you) that in my case, genetic origins are not necessarily paternal, and that nurture factors support the father's demeanor. Of course, my mother is quite the extrovert, so it is hard to dismiss such a prominent (if reactive) potential influence.