#trisomy  chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
  supertype:  chromosomal_aberration__chromosomalaberration__chromosomal_anomaly__chromosomalanomaly__chrosomal_abnormality__chrosomalabnormality__chromosonal_disorder__chromosonaldisorder  any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities
  subtype:  mongolism__mongolianism__Down's_syndrome__Down_syndrome__trisomy_21__trisomy21  a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation

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