A Y-linked gene is responsible for hypertrichosis (long hair on ears). When an affected man marries a normal woman, what percentage of their daughters would be expected to have hairy ears?

The correct option is C 0%
Only males normally have a Y chromosome, Y-linked genes can only be transmitted from father to son. So, when a hypertrichosis (long hair on ears) affected man marries a normal woman, 0% of daughters will be affected. Daughters do not inherit Y chromosome.