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I am Lyosha [343]
3 years ago
5

What genetic abnormality causes Down Syndrome? How does this usually happen?

Biology
1 answer:
Bad White [126]3 years ago
8 0
About 95% 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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