Blood group genes and Negro-white ability differences.

Abstract

Data on samples of 40 and 44 Negro adolescents from two twin studies were used to test Shockley's hypothesis that blood group genes more characteristic of European than African populations would tend to be associated with good performance on cognitive tests within the U.S. Negro population. This was not found to be the case. This result may not, however, be a very strong test of the genetic basis of the between-group IQ difference, because of independent assortment of blood group and ability genes over a number of generations among U.S. Negroes.