52.9 MB (7.3 MB compressed)
5203 x 3551 pixels
43.9 x 30.0 cm ⏐ 17.3 x 11.8 in (300dpi)
JOTI / SCIENCE PHOTO LIBRARY JOTI / SCIENCE PHOTO LIBRARY
Editorial use only.
Baby with Down syndrome. One-year- old baby girl and a friend playing with toys on the floor. Down's syndrome is a chromosomal abnormality resulting in mental handicap and a characteristic physical appearance. The genetic defect concerns chromosome number 21, as there are three of these chromosomes instead of the normal two. For this reason the disorder is also called trisomy 21. The main physical features are slanted eyes, a flat nose on a round head and abnormalities of the palms of the hands and the soles of the feet. Children with Down's syndrome usually have below average I.Q. of between 30 and 80.
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