A member asked:

What's the most common chromosomal abnormality syndrome in humans?

A doctor has provided 1 answer
Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

Down syndrome.: The most common chromosomal abnormality in a newborn population was trisomy 21 (down), with an incidence of 1 in 730 live births. Abnormalities of the sex chromosomes (eg, monosomy x or turner, xxy, xyy, xxx) and structural balanced rearrangements also occurred frequently. Trisomy 16 is the most common aneuploidy in abortuses. Trisomy 18 (edwards), and 13 (patau) are most common in stillborns.

Answered 2/27/2018

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