The mutation known as trisomy 21, in which an extra copy of chromosome 21 is present, is more commonly known as:

Name: The mutation known as trisomy 21, in which an extra copy of chromosome 21 is present, is more commonly known as:
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Trisomy 21 is commonly known as Down syndrome. Turner syndrome is due to monosomy X, Klinefelter's syndrome is due to an extra X chromosome in males, and Williams syndrome is caused by a deletion of genetic material on chromosome 7.

The Mutation Known as Trisomy 21, in Which an Extra