Ultrasound and maternal serum marker tests are less informative than amniocentesis or chorionic villus sampling (CVS) in diagnosing trisomy 21 because
A) ultrasound and maternal serum markers check chromosomes, and CVS and amniocentesis do not.
B) ultrasound and maternal serum markers do not check chromosomes, and CVS and amniocentesis do.
C) maternal serum markers and amniocentesis check chromosomes, and ultrasound and CVS do not.
D) ultrasound and CVS check chromosomes, and maternal serum markers and amniocentesis do not.

Question

Quizplus · Accepted Answer

Ultrasound and maternal serum marker tests do not check chromosomes to diagnose trisomy 21, while amniocentesis and CVS both analyze the chromosomes within fetal cells to determine the presence of the genetic abnormality.

Ultrasound and Maternal Serum Marker Tests Are Less Informative Than