title: Segregation of a D-G translocation in three families.
mesh_terms: D002869:Chromosome Aberrations; D002901:Chromosomes, Human, 13-15; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics; D005260:Female; D006579:Heterozygote; D006801:Humans; D008297:Male; D008540:Meiosis; D010375:Pedigree; D010641:Phenotype