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What is the most common source of the extra chromosome 21 in an individual with down syndrome?.
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What is the most common source of the extra chromosome 21 in an individual with down syndrome?.

User Comet
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Answer:

Trisomy 21 passed down from one of the parents or it could be that a fault in the cell division in one of the parents occurred resulting in an extra chromosome

User Saad Mirza
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