Down Syndrome
Published on Mar 19, 2016
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PRESENTATION OUTLINE
DOWN SYNDROME IS A GENETIC CONDITION IN WHICH
A PERSON HAS 47 CHROMOSOMES INSTEAD OF THE USUAL 46.
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NAMED AFTER JOHN L. H. DOWN (1828–96),
THE ENGLISH PHYSICIAN WHO FIRST DESCRIBED IT.
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CHARACTERISTIC FACIAL APPEARANCE, AND WEAK MUSCLE TONE (HYPOTONIA)
ALL AFFECTED INDIVIDUALS EXPERIENCE COGNITIVE DELAYS,
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THE CONDITION HAVE SOME DEGREE OF RETARDATION
AS WELL AS CHARACTERISTIC PHYSICAL FEATURES
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MANY OF THESE CHILDREN ALSO HAVE OTHER HEALTH PROBLEMS.
APPROXIMATELY ONE IN EVERY 800 TO 1,000 NEWBORNS HAS DOWN SYNDROM
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THE MOST COMMON FORM OF DOWN SYNDROME IS OFTEN CALLED "TRISOMY 21
BECAUSE INDIVIDUALS WITH THIS CONDITION HAVE THREE COPIES OF THE 21ST CHROMOSOME.
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