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?

A 30-year-old G2P1 patient at 32 weeks’ gestation is noted t…

A 30-year-old G2P1 patient at 32 weeks’ gestation is noted to have a fetus with asymmetric fetal growth restriction (FGR), characterized by a normal head circumference and a disproportionately small abdominal circumference. Which of the following is the most likely underlying cause?