title: Chromosome polymorphism and twin zygosity.
mesh_terms: D000293:Adolescent; D000328:Adult; D001399:Azure Stains; D001789:Blood Group Antigens; D002648:Child; D002875:Chromosomes / Q000648:ultrastructure*; D003584:Cytological Techniques; D005260:Female; D005787:Gene Frequency; D005821:Genetic Techniques; D014644:Genetic Variation; D005838:Genotype; D006570:Heterochromatin / Q000378:metabolism; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007621:Karyotyping; D008297:Male; D011110:Polymorphism, Genetic; D011247:Pregnancy; D011796:Quinacrine; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D001399:Azure Stains; D001789:Blood Group Antigens; D006570:Heterochromatin; D011796:Quinacrine