Culture is downstream of biology

To what extent are differences in behaviour between ethnic groups cultural, and how much, if any, is coded in the genes Ross, Ronald; Bernstein, Leslie; Judd, Howard; Hanisch, Rosemarie; Pike, Malcolm; Henderson, Brian (1986) Serum Testosterone Levels in Healthy Young Black and White Men, JNCI: Journal of the National Cancer Institute, Volume 76, Issue 1, January 1986, Pages 4548. Richard, A.; Rohrmann, S; Zhang, L.; Eichholzer, M.; Basaria, S.; Selvin, E.; Dobs, A. S.; Kanarek, N.; Menke, A.; Nelson, W. G.; Platz, E. A. (2014) Racial variation in sex steroid hormone concentration in black and white men: a metaanalysis, Andrology May 2014 2 (3): 428435.