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Harper Martinez——Studied at the University of Zurich, Lives in Zurich, Switzerland.
The most common form of
Down syndrome is known as trisomy 21, a condition where individuals have 47 chromosomes in each cell instead of 46. Trisomy 21 is
caused by an error in cell division called nondisjunction. This leaves a sperm or egg cell with an extra copy of chromosome 21 before or at conception.
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