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musickatia [10]
3 years ago
14

An extra copy of chromosome 21 in humans causes

Biology
2 answers:
Charra [1.4K]3 years ago
4 0
Down syndrome is the result of an extra copy of chromosome 21 in a human.
jasenka [17]3 years ago
3 0

Answer:

Down syndrome is when there is an extra copy of chromosome 21

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