title: Nondisjunction versus nonconjunction.
authors.forename: R J
authors.initials: RJ
authors.lastname: Gardner
mesh_terms: D002891:Chromosomes, Human, Pair 21; D004314:Down Syndrome / Q000235:genetics; D005260:Female; D006801:Humans; D008540:Meiosis; D009630:Nondisjunction, Genetic; D011995:Recombination, Genetic / Q000235:genetics