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Haemophilia is a sex-linked recessive disorder - which means it can skip a generation, but only if it is carried in the female line.

A female can be a carrier of haemophilia, but a male cannot. This is because males only have one X chromosome, so if they have a defective X they will have the disorder. If a father has haemophilia, all of his daughters will also have haemophilia.

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