title: Studies on chromosomal nondisjunction in man. II.
mesh_terms: D000650:Amnion / Q000166:cytology; D002869:Chromosome Aberrations / Q000453:epidemiology*; D025063:Chromosome Disorders; D003120:Colorado; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D009030:Mosaicism / Q000453:epidemiology; D012621:Seasons; D012728:Sex Chromatin; D012924:Social Conditions