Which of the Following Conditions Results from Monosomy

Question

Which of the following conditions results from monosomy?
A) Down syndrome
B) Turner syndrome
C) Klinefelter syndrome
D) both A and C above

Accepted Answer

Turner syndrome is caused by the presence of only one X chromosome (monosomy X) in females. Down syndrome and Klinefelter syndrome are caused by trisomy (having an extra chromosome), not monosomy.