Our data are compatible with a between-group heritability (variance explained by European ancestry) of between 50% and 70% depending on the model chosen (see Scarr et al.,p. 85). This estimate of between-group heritability is consistent with Rushton and Jensen’s[9] hereditarian model, according to which 50%–80% of the African-/European-American cognitive difference is due to genetic differences. https://www.unz.com/jthompson/no-skin-in-the-game/