title: The frequency of trisomy and translocation in Down's syndrome.
mesh_terms: D000328:Adult; D002675:Child, Preschool; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D008423:Maternal Age; D009030:Mosaicism; D011247:Pregnancy