Females rarely experience the physiologic def | vedclass

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(B) Haemophilia is an $X$-linked recessive disorder.In females,there are two $X$ chromosomes $(XX)$.For a female to express the disease,she must inher

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Homozygous for the defect

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(B) Haemophilia is an $X$-linked recessive disorder.In females,there are two $X$ chromosomes $(XX)$.For a female to express the disease,she must inherit the defective gene on both $X$ chromosomes.If a female has only one defective gene,she is a carrier and does not show the symptoms of the disease.Therefore,a female expresses the disease only when she is homozygous for the recessive allele $(X^hX^h)$.

Females rarely experience the physiologic defect of haemophilia because they do so only when they are:

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