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Down Syndrome 4
Beginning of paper
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 nine .... Middle of paper
.... is called "Down's" in Europe.
In the first part of the twentieth century, there was much speculation of
the cause of Down syndrome. The first people to speculate that it might be
due to chromosomal abnormalities were Waardenberg and Bleyer in the
1930s. But it wasn't until 1959 that Jerome Lejeune and Patricia Jacobs,
working independently, first determined the cause to be trisomy of the 21st
chromosome. Cases of Down syndrome due t ....
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Number of words: 1135
Number of pages: 5 (approx. 250 words per double-spaced page)
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