(trisomy 21)

  1. A form of mental retardation generally caused by an extra chromosome. The child's IQ is usually less than 50 and his or her physical characteristics are distinctive, most notably slanted eyes.
     
  2. A common form of mental retardation caused by a chromosomal abnormality; formerly called mongolism.  Two types are recognized, based on the nature of the chromosomal aberration: the translocation type and the nondisjunction type.  Physical findings include widely spaced eyes with slanting openings, small head with flattened occiput, lax joints, flabby hands, small ears, and congenitial anomalies of the heart.
    Source: Edgerton, Jane E. 1994. American Psychiatric Glossary, 7th Edition. Washington, DC: American Psychiatric Press

See also chromosome 21.












   

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