The ABO blood groups and the B atypical gene in Brazil: a serologic and population genetic approach to the issue.
The fit to Hardy-Weinberg equilibrium is improved if an atypical B allele is assumed to exist along with the A1, Aint, A2, B, and O genes in the ABO system. This atypical B allele accounts for 37% or so of the total B gene frequency in both Brazilian whites and blacks.
D000017:ABO Blood-Group System / Q000235:genetics*; D000483:Alleles; D044383:Black People; D001938:Brazil; D005787:Gene Frequency; D006801:Humans; D044465:White People
D000017:ABO Blood-Group System