Link: University Diaries.
UD has already, on this blog, reported the discovery of the AH gene, predisposing carriers, in the words of the study, "to chronic behavior in an obnoxious, boorish, selfish, overbearing, and generally offensive manner (pp. 128 - 129)."
AH-Carriers have "four alleles... which [we] refer to as rectalleles." Depending on the combination of alleles in carriers, they may be "complete AH's" or lesser varieties of these.
That explains a lot!