Male pattern baldness is a recessive sex-linked trait carried on the X
chromosome. A man with male-pattern baldness is concerned about
having children who also lose their hair. Which of these would be true
about the chances of his happening?

A. all his sons will develop baldness
B. his sons have a chance of developing baldness if he marries a woman who is heterozygous for the trait
C. he can only have children that develop male-pattern baldness if he marries a woman who is homozygous dominant for the trait
D. none of his sons will develop baldness