What is the cause of down's …
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Posted by Ritika Kohli 6 years, 10 months ago
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Payal Singh 6 years, 10 months ago
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, which leaves a sperm or egg cell with an extra copy of chromosome 21 before or at conception
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