It does seem logical that there would be a 'baseline' of sorts, from which our personalities are based, which would be inherited. After all, there are many psychological traits that are so ingrained into our psyche that they override all other thoughts or reflexes at the time. Given that something like that can be inherited, it seems almost menial that personality traits could be inherited, also.
That really is quite fascinating; that life experiences can influence our DNA, even if it is just to a small extent. For some obscure reason, I find that strangely liberating. And slightly terrifying, also. So when people say that one passes their troubles onto their children.. That can be taken quite literally, in some cases.

I'd really appreciate if you'd share your thoughts on the matter, and I think I would really enjoy reading an entry about that personally, at any rate. ^^ I don't often get an opportunity to discuss these types of things. Not that I have much to offer to the conversation. At all. xD