Sakke wrote:One thing I'd really like to know, but is probably hard to study: Two unrelated men have for some unknown reason identical minds. Then, one of them kills his wife for cheating. Now, is any one of them more likely to kill another person than the other? And who?
I believe I might be able to afford some sort of answer there. As much as psycholigists have attempted to argue otherwise, it's all genetics. Now, there's your DNA genetics, and your 'epigenetics', which is basically how your DNA code is regulated, modified before yews, and enabled/disabled by the yews of DNA-attaching compounds (active, inactive, and everywhere in between), and RNA message modifying compounds (cuts, adds, code swaps). While having a gene (or not ahving one) does not automatically make you a killer, it makes you more sussceptable. I belive in my genetics class, we talked about some genes that have been linked to aggression (kind of like genes linked to hair color, hieght, eye color).
Now, here's where the epigenetics comes into play. These genes may be completely deactivated by your epigenome, and therefore never become a factor. On the other hand, they could be unrestricted, causing higher aggression. On a third hand (borrowing a second person here), they could be partially restricted to various degrees, causing expression to varying degrees.
Now, this brings up the whole 'nature vs. nurture' question of psychology, which has been answered by genetics. Epigenetic modifications are affected by a person's environment. For example, the presence of say a certain sugar in the body prompts the body to unregulate the DNA code for an enzmyme to break down the sugar. External influences, such as family structure, other actions of relatives, even the color of your clothes, is known to have slight effects though an unknown method (at least unknown when I took the class over a year ago).
So, in effect it is both nature AND nurture. Your DNA code basically makes you 'susceptable' to being a certain way. Your epigenome determines how much you 'develop' along your susceptability. In that way, people with identical DNA codes (such as fraternal? twins) can become different. One sat to the left, while one sat to the right, and thus a small change to DNA expression is made.
With all that groundwork out of the way, to answer your question, it can be dificult to say outright who is more likely to kill another person. However, since one man already killed his wife, he has sumitted considerable evidence that his epigenome has tailored him to be more likely to kill.