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Leona [35]
3 years ago
12

People with Down syndrome usually have ______ of the 21st chromosome.

Biology
2 answers:
Ivahew [28]3 years ago
7 0
People with Down syndrome usually have trisomy of the 21st chromosome.
Elena-2011 [213]3 years ago
6 0
It is caused by a trisomy in the 21st chromosome 
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