title: Sex ratio in man: an analysis of the relationship with ABO blood groups and placental alkaline phosphatase phenotype.
abstract: Secondary sex ratio (SR) in man is influenced by various genetic and environmental factors. It has been observed that SR in subjects of blood group B compatible with their mothers is higher than in other subjects. The analysis of 676 newborns of the Rome population and 1,684 newborns of the New Haven (Connecticut) population have confirmed a higher SR in B group subjects compatible with their mothers. The data also indicate that placental alkaline phosphatase is another genetic factor influencing SR in man and that there is a strong interaction among ABO phenotype, fetomaternal ABO compatible status and PAP phenotype concerning their effects on SR.
mesh_terms: D000017:ABO Blood-Group System; D000469:Alkaline Phosphatase / Q000235:genetics*; D003237:Connecticut; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D010920:Placenta / Q000201:enzymology*; D011247:Pregnancy; D012384:Rome; D012744:Sex Ratio
chemical_list: D000017:ABO Blood-Group System; D000469:Alkaline Phosphatase