Ideologiernas genetiska grund

Jag har tidigare rapporterat om en studie som antyder att politiska uppfattningar kan ha biologisk grund. Samma slutsats nås i tvillingstudien ”Are Political Orientations Genetically Transmitted?”, publicerad i American Political Science Review:

We test the possibility that political attitudes and behaviors are the result of both environmental and genetic factors. Employing standard methodological approaches in behavioral genetics—specifically, comparisons of the differential correlations of the attitudes of monozygotic twins and dizygotic twins—we analyze data drawn from a large sample of twins in the United States, supplemented with findings from twins in Australia. The results indicate that genetics plays an important role in shaping political attitudes and ideologies but a more modest role in forming party identification; as such, they call for finer distinctions in theorizing about the sources of political attitudes.

Jag undrar i vilken mån statsvetare och andra som studerar hur grundläggande politiska uppfattningar uppkommer inkorporerar genetiska faktorer. Att dessa inte förklarar allt, t.ex. partival, är en annan sak, men de tycks ha ett betydande förklaringsvärde för ideologisk inriktning.