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A level biology question

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 10 months ago)

Screen Shot 2023-06-14 at 12.00.40.png84.1KB

Reply 1

Fire dude

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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