title: A zygosity questionnaire for young twins: a research note.
authors.affiliation: Department of Psychology, University of Oregon, Eugene 97403.
authors.forename: H H
authors.initials: HH
authors.lastname: Goldsmith
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D010641:Phenotype; D014429:Twins, Dizygotic / Q000145:classification / Q000235:genetics*; D014430:Twins, Monozygotic / Q000145:classification / Q000235:genetics*
chemical_list: D000017:ABO Blood-Group System