What is cause of mongolism
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Trisomy 21.
About 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.
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The mongolism is caused by congenital disorder caused by the presence in the human genome of extra genetic material from chromosome 21.
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