Question

How is it that human females are rare
heamophily?​

Answer 1

Answer:

Haemophilia is a X linked recessive disorder. In human females both the allosomes are X chromosomes, so for haemophilia to be seen in females both the X chromosomes need to be affected.

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Answer 2

Answer:

Human females are rare heamophily because females have two X chromosomes (XX), while males have only one (xy),so the defective gene is guaranteed to manifest in any male who carries it.As females having two defective copies of the gene is very rare.

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