The Student Room Group

A level biology question

How do you answer part 2? I understand that 4 is hairless but 1 has hair so this could be used to explain it, but surely 1 and 2 could both be heterozygous Hh to create 4 as hh offspring? so it doesn't necessarily have to be sex linked?
(edited 1 year ago)
i've done questions like this where the answer was literally just that the mother (5) must be a carrier and only passes it onto her sons. because the gene is recessive and males only have one x chromosome, they get it whereas the daughters don't

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