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Down Syndrome 4
Beginning of essay
Down syndrome is a chromosomal abnormality. It is the most frequent
form of mental retardation and is characterised by well-defined, distinctive
phenotypic features and natural history. An error in cell development results
in forty-seven chromosomes rather than the usual forty-six. There are three
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Middle of essay
....r the next three years.
The estimated incidence of Down syndrome is between 1 in 1,000 to 1
in 1,100 live births. Each year approximately 3,000 to 5,000 children are born
with this chromosome disorder. It is believed there are about 250,000 families
in the United States who are affected by Down syndrome.
Mode of Inheritance
Although many theories have been developed, it is not known what
actually causes Down syndrome. Some professionals believe that hormonal
abnormalities (X-rays, v.... |
| Number of words: 1135 |
Approximate pages: 5 |
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