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Haemophilia is a (sex) X linked recessive disease. This means the disease is spread via the X chromosome.

Males having one X chromosome and one Y chromosome are more likely to get haemophilia. An overall probability generalisation for a male to get haemophilia is 50%, it would be that they either have it and show the symptoms or they don't have It at all, it is impossible for a male to have haemophilia but not show symptoms.

This is not the same for females, females have a 2/3 chance of not showing symptoms of haemophilia; being 1/3 chance that they'd be carriers but don't show any symptoms and 1/3 chance that they would not get infected with haemophilia and 1/3 chance that they'd have haemophilia and show symptoms of it.

This is because females have two X chromosomes. A female must have both chromosomes infected with haemophilia for them to show the symptoms, but if one chromosome has haemophilia and the other does not then the chromosomes will balance out and the......

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Approximate Pages: 3 (250 words per double-spaced page)

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