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(D) Haemophilia is a sex-linked genetic disorder.It is caused by a mutation in the genes responsible for the production of blood clotting factors.Spec

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$X$-linked recessive gene disorder

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(D) Haemophilia is a sex-linked genetic disorder.It is caused by a mutation in the genes responsible for the production of blood clotting factors.Specifically,it is an $X$-linked recessive disorder,meaning the defective gene is located on the $X$ chromosome.Since it is recessive,males (who have only one $X$ chromosome) are more frequently affected than females,as they only need one copy of the defective gene to express the disease.

Which of the following most appropriately describes haemophilia?

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