5 doctors weighed in:

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

5 doctors weighed in
Dr. Nikolaos Zacharias
Obstetrics & Gynecology - Maternal Fetal Medicine
4 doctors agree

In brief: Extra chromosome 21.

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

In brief: Extra chromosome 21.

Either complete or partial trisomy for chromosome 21 is always responsible for down syndrome.
Dr. Nikolaos Zacharias
Dr. Nikolaos Zacharias
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