Human Sociogenetics
In three cities of Chile (Santiago, Valparaiso, Valdivia) the A allele and phenotype (ABO blood group) are more frequent in the higher socioeconomic strata (SES) and the O allele and phenotype are in the lower ones.This constitutes a structured sociogenetic cline (SGC).The B allele and phenotypes (B+AB) present a rather erratic or contradictory dis