In order for a girl to inherit hemophilia A,her parents would have which genotypes?

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Hemophilia A is an X-linked recessive disorder, inherited on the X chromosome. Females have two X chromosomes and males have one X and one Y chromosome. The unaffected allele is represented by XH (normal clotting factor) and the affected allele is represented by Xh (hemophilia). For a girl to inherit hemophilia A, she must receive an X chromosome with the Xh allele from both parents. In option D, the mother is a carrier (XH Xh) and the father has hemophilia (Xh Y), which means there is a 50% chance of the daughter receiving the Xh allele from each parent, giving her the genotype Xh Xh and expressing hemophilia A.

In Order for a Girl to Inherit Hemophilia A,her Parents