Not to speak too geekish, but I personally believe that yes, there is genetic predisposition toward 'aggressive' behavior. That said, I think there is also a tremendous amount of variability within a given species, as well. In a way, it all goes back to the whole 'nature vs nurture' debate, right? Are we a product of our genes or of our environment. Current theory holds that it is a combination of both and I tend to agree.
Cheers,
Kat
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