..Harvard psychologists took a look at how black children adopted by well off upper-middle class white families at a very young age perform on IQ tests once they grow up in white families with good socioeconomic conditions. Black children adopted by white parents average 89 on IQ tests at age 17 (slightly better than the 85 average for blacks nationally). White children who grew up in the same households and had white biological parents on average scored 109. Even with the same socioeconomic upbringing, the racial IQ gap remains.