A possible immunological influence on sex ratio.
D000017:ABO Blood-Group System; D000818:Animals; D000937:Antigen-Antibody Reactions; D001789:Blood Group Antigens; D002875:Chromosomes; D010064:Embryo Implantation; D005260:Female; D006801:Humans; D051379:Mice; D051381:Rats; D012723:Sex
D000017:ABO Blood-Group System; D001789:Blood Group Antigens