If you are a male, then you have X from mother and Y from father. IF the X chromosome that you inherited from your mother has hair loss genes then you have a 50% chance of experiencing hair loss
On the contrary, if a male should inherit an affected X chromosome from his mother, he is sure to have the pattern baldness. The chance is 100% and not 50%.
For X-linked traits, males only need just one allele for the trait in order to exhibit the trait. This is because males have only one X chromosome. Females will need 2 alleles, each one the two X chromosomes in order to be affected. This is why males are more affected by X-linked disorders than females.
I should have said, the probability of inheriting the affected gene from the mother is 50%.
Thank you for pointing out this error. I Appreciate it.