When I studied anthropology in the 90s, it was a widely held belief that genetics could potentially influence personality, intelligence, etc., but there was no conclusive evidence that it actually did so, and quite a few studies suggesting so had been debunked. There have since been quite a number of studies that indicate this is in fact so, even including more promising studies challenging Gould, et al.'s assertions that racial heritage plays no role in adult intelligence. I still don't know to what level any of these are conclusive, or to what extent we have improved our ability to quantify aspects of, broadly speaking, personality.