A foundational question in the social sciences concerns the interplayof underlying causes in the formation of people’s politicalbeliefs and prejudices. What role, if any, do genes, environmentalinfluences, or personality dispositions play? Social DominanceOrientation (SDO), an influential index of people’s general attitudestoward intergroup hierarchy, correlates robustly with politicalbeliefs. SDO consists of the sub-dimensions SDO-Dominance(SDO-D), which is the desire people have for some groups to beactively oppressed by others, and SDO-Egalitarianism (SDO-E), apreference for intergroup inequality. Using a twin design (N =1987), we investigate if the desire for intergroup dominance andinequality makes up a genetically grounded behavioral syndrome.Specifically, we investigate the heritability of SDO, in addition towhether it genetically correlates with support for political policiesconcerning the distribution of power and resources to differentsocial groups. In addition to moderate heritability estimates forSDO-D and SDO-E (37% and 24%, respectively), we find that thegenetic correlation between these sub-dimensions and politicalattitudes was overall high (mean genetic correlation 0.51), whilethe environmental correlation was very low (mean environmentalcorrelation 0.08). This suggests that the relationship betweenpolitical attitudes and SDO-D and SDO-E is grounded in commongenetics, such that the desire for (versus opposition to) intergroupinequality and support for political attitudes that serve to enhance(versus attenuate) societal disparities form convergent strategiesfor navigating group-based dominance hierarchies.