Biology, asked by bhuvan932, 11 months ago

What is trisomy?give its cause​

Answers

Answered by ansistkharms
1

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. Mosaic Down syndrome.

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