Down Syndrome 4
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 percent of individuals with
Down syndrome have Trisomy 21. There is also Translocation and
Mosaicism. Down syndrome can also be referred to as Mongolism, the
condition is named for John Langdon Down. Down was the superintendent o ....
Word count: 1135 - Page count: 5
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