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Down Syndrome
Part 1 of Paper
.... Syndrome; a genetic disorder resulting in mental retardation.
In 1866, physician John Langdon Down, in Surrey England, identified a set of children with common features of mental retardation. Down was first to identify a similar link of symptoms in many patients. Thus, the new disorder was named "Down's Syndrome". .... Part 2 of Paper
....tilization. About 95% of Down's syndrome births are Type Trisomy 21.
Roughly 4% are caused by Translocation, "where the extra chromosome twenty one is broken off and becomes attached to another chromosome pair.
The last 1% have Mosaicism, where only some cells of the chromosome have extra genetic material.
With the different types of Down's the degree of retardation ranges from mild to sever. Alleles don't effect every patient in the same way, and therefore different effects of the disease are p.... |
| Number of words: 822 - Approximate pages: 3 |
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