What is the Sex Chromosome Make-Up of a Normal Male

Question

What is the sex chromosome make-up of a normal male?
A) XXY
B) XY
C) XX
D) XXX
E) XO

Accepted Answer

A normal male has one X and one Y sex chromosome, making their sex chromosome make-up XY. A is incorrect because that would indicate Klinefelter syndrome, in which an individual has an extra X chromosome. C, D, and E are all incorrect because they do not have a Y chromosome, which is necessary for male development.