KEVIN BEEBE / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY KEVIN BEEBE / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Down's syndrome. Smiling young girl with Down's syndrome, sitting on a swing in a play area. Down's syndrome is a chromosomal abnormality resulting in mental handicap and a characteristic physical appearance. The genetic defect concerns chromosome number 21, in which there are three of these chromosomes instead of the normal two. The disorder is also called - trisomy 21. The main physical features are slanted eyes, a flat nose on a round head & abnormalities of the palms of hands and soles of the feet. Mental attainment is usually restricted to that of a five-year-old child (I.Q. between 50-60).
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