And as we all know, IQ is a perfect measure of mental capability and the only thing that really matters in the end. Self-confidence, ambition, passion, knowledge - that's just balderdash!
Twin studies on personality factors[1] find that genetic heritability explains 40-50% of the cross-sectional variance in adults, while the impact of family environment is non-significant. All of those factors you listed show a nearly identical genetic pre-disposition as IQ itself.
