A reader inquired about research on ethnoracial differences in personality. There actually is a growing body of research on this. Why? Given IQ differences, to avoid unequal proportionality (i.e. disparate impact), a number of industrial psychologists have advocated using personality measures in place of cognitive measures. As it has turned out, though, there are average differences in personality too. So now there is ongoing research on the unequal proportionality caused by using personality tests (1,2 ). Could the differences partly be due to nature? The heritability of personality factors range for .33 to .65 and several genes have already been identified which code for individual personality differences  (in some populations), so it’s possible — if you want, you can enter some of the associated polymophisms found by de Moor et al. (2010) into Hapmap and see if it turns up anything. I can’t imagine a large genetic effect, but who knows.
Anyways, I edited the tables from a recent meta analysis (4) which compared Asians, Blacks, Indians, Hispanics, and Whites on the Big 5. The only large differences are between Asians and Blacks. These, however, move in the opposite direction of the cognitive differences, leading to a Scylla and Charybdis for IO
psychologists. [d means standardized difference; a d of .1 would be equivalent to 1.5 points if translated into white IQ metrics (SD=15)].
 Hausdorf and Risav, 2010. Decision Making Using Personality Assessment: Implications for Adverse Impact and Hiring Rates
 Hausdorf and Risav, 2011. Personality Testing in Personnel Selection: Adverse impact and differential hiring rates
 de Moor, et al., 2010. Meta-analysis of genome-wide association studies for personality
 Foldes et al., 2008. Group differences in personality: meta-analyses comparing five U.S. racial groups