Haemophilia is an example of:

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(B) Haemophilia is a genetic disorder caused by a defect in the genes responsible for blood clotting.It is a $X$-linked recessive trait,meaning the ge

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Sex-linked recessive trait

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(B) Haemophilia is a genetic disorder caused by a defect in the genes responsible for blood clotting.It is a $X$-linked recessive trait,meaning the gene responsible for the disease is located on the $X$ chromosome.Since it is recessive,a female must have the defective gene on both $X$ chromosomes to express the disease,while a male only needs one defective $X$ chromosome to express it because they have only one $X$ chromosome.Therefore,it is classified as a sex-linked recessive disorder.

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