Ancestry

The post of today is ancestry. Do you think that ancestry has something to do with modern behavior? Would someone with Irish blood have a tendency drinking and brawling than someone with an Arabic background? Or is it all in the person's head? I believe it is the latter, for I am 3/4ths Scot-Irish, and I have never had the desire to bust heads, drink myself into a stupor, or eat haggis. Please put your opinions in the comments box.