Biology

Question

A woman who is a carrier for hemophilia marries a hemophiliac man. What will be their children’s possible phenotypes?

1 Answer

  • Answer:

    Hemophilia is a sex-linked recessive disorder in which a person's blood do not clots and he can bleed to death even after minor injuries because blood will keep running due to a small cut.

    It is a recessive trait which means that even if one normal gene is present along with Hemophiliac gene, the person will not have the disease and he will be the carrier.

    Question: What will be their children’s possible phenotypes?

    If a woman who is a carrier for hemophilia marries a hemophiliac man, their genotypes can be denotes as :

    Here H, indicate normal gene and small h indicate defected (hemophilia) gene.

    Parents:                      XHXh                   X           XhY

    Offspring:                   XHXh : XHY:  XhXh:  XhY

    Phenotype of offspring:

    XHXh:  The child will be daughter and normal (25 % chances)

    XHY:     The child will be son and normal (25 % chances)

    XhXh:   The child will be girl and Hemophiliac (25 % chances)

    XhY:      The child will be son and Hemophiliac (25 % chances)

    Hope it helps!

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