title: [Occurrence of an extra chromosome marker in persons with normal phenotype (author's transl)].
mesh_terms: D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D006801:Humans; D007621:Karyotyping; D010375:Pedigree; D010641:Phenotype; D014314:Trisomy
vernacular_title: Wystepowanie dodatkowego chromosomu "mar." u osób o prawidłowym fenotypie.