What is the cause of haemophilia?

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(C) Haemophilia is a sex-linked recessive disorder,which shows its transmission from an unaffected carrier female to some of the male progeny.It is ca

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$X$-linked mutation

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(C) Haemophilia is a sex-linked recessive disorder,which shows its transmission from an unaffected carrier female to some of the male progeny.It is caused by a mutation in the genes located on the $X$ chromosome,which are responsible for the synthesis of proteins involved in the blood clotting cascade.Therefore,it is classified as an $X$-linked recessive disorder.

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