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Carriers vs Affected Individuals

A Y-linked ge...

Question

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?

A

1%

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B

100%

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C

0%

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D

50%

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Solution

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.

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