Chorionic Villus Sampling reveals that a fetus has the karyotype 47,XX,+21.What is the diagnosis?
A)Edward syndrome
B)Turner syndrome
C)Down syndrome
D)Klinefelter syndrome

Question

Quizplus · Accepted Answer

The karyotype of 47,XX,+21 indicates that there is an extra copy of chromosome 21, which is characteristic of Down syndrome. Edward syndrome (A) is characterized by trisomy of chromosome 18, Turner syndrome (B) is characterized by monosomy of the X chromosome in females, and Klinefelter syndrome (D) is characterized by an extra X chromosome in males (47,XXY).

Chorionic Villus Sampling Reveals That a Fetus Has the Karyotype