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A member asked:

Is down syndrome always caused by a defect in the 21 chromosome?

A doctor has provided 1 answer
Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

Extra chromosome 21.: Either complete or partial trisomy for chromosome 21 is always responsible for down syndrome.

Dr Ferguson and 3 doctors agreed

Answered 9/22/2016

5.7k views

Thank

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