A 22 year old woman and her partner are being counseled afte…
A 22 year old woman and her partner are being counseled after a first-trimester miscarriage. She has no significant medical problems. In counseling this couple you explain in lay terms that the most likely cause of her miscarriage was aneuploidy. The most common aneuploidy in abortuses, which accounts for approximately 20% of 1st trimester losses, is which of the following?