Adult IQ is extremely heritable (most of the variance in adult IQ is caused by genetics). Parenting style is basically meaningless for IQ unless you are beating your children or your home is illiterate. Blacks in the U.S. have precisely the IQ you would predict based on their mix of white and african genes (african IQ is lower than american black IQ, the '57' black africans in this chart is skewed because african immigrants to the U.S. are more likely to have higher IQ, look up Richard Lynn).

Adult IQ is extremely heritable (most of the variance in adult IQ is caused by genetics). Parenting style is basically meaningless for IQ unless you are beating your children or your home is illiterate. Blacks in the U.S. have precisely the IQ you would predict based on their mix of white and african genes (african IQ is lower than american black IQ, the '57' black africans in this chart is BS, look up Richard Lynn).