How Are the X and Y Chromosomes in Males Different

Multiple Choice

How are the X and Y chromosomes in males different from other diploid cells?

A) Genes on the X and Y chromosome do not have a second copy.
B) Genes on the X and Y chromosome express an extra copy of each gene.
C) The X and Y chromosome in males preferentially express specific genes while silencing others.
D) A and C.
E) None of the above