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Down Syndrome 4
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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
major types of Down syndrome. About ninety-five pe ....
Middle of paper
....me Lejeune and Patricia Jacobs,
working independently, first determined the cause to be trisomy of the 21st
chromosome. Cases of Down syndrome due to translocation and mosaicism
were described over 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 .... |
| Word count: 1135 |
Page count: 5 |
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