title: Familial marker chromosome due to 3:1 disjunction of t(9;15) in a grandparent.
abstract: An extra small chromosome detected in amniotic fluid was identified as the product of a translocation [46,XX,t(9;15)(p24;q11.2)]. This case is unusual in that individuals with the unbalanced karyotype resulting from a 3:1 disjunction are phenotypically normal.
authors.affiliation: Department of Pathology, Toronto General Hospital, Canada.
authors.forename: E J
authors.initials: EJ
authors.lastname: Winsor
authors.forename: M I
authors.initials: MI
authors.lastname: Van Allen
mesh_terms: D000649:Amniocentesis; D002869:Chromosome Aberrations / Q000235:genetics*; D002884:Chromosomes, Human, Pair 15; D005819:Genetic Markers; D006801:Humans; D007621:Karyotyping; D011296:Prenatal Diagnosis; D014178:Translocation, Genetic / Q000235:genetics*
chemical_list: D005819:Genetic Markers