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A member asked:
What are the different causes down syndrome?
4 doctors weighed in across 2 answers
Downs syndrome: Trisomy 21 when there is an extra chromosome at 21, mosaicism when some cells have trisomy and others not, robertson translocation [n which long arm of 21 chromosome is attached to another chromosome often chromosome 14.
Answered 9/8/2014
5.9k views
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W varieties: The most common cause is trisomy 21, a situation with 3 number 21 chromosomes. A second possibility is a partial translocation of a piece of a 21 chromosome onto another chromosome.
Answered 6/19/2015
2.7k views
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