Hemophilia is a recessive trait. The dominant trait is normal blood dotting A ge

Question

Hemophilia is a recessive trait. The dominant trait is normal blood dotting A gene that can cause hemophilia is located on the X chromosome. If a homozygous normal female marries a normal male, they children might have which of the following phenotypes: Select one: a. normal females, hemophiliac females, and hemophiliac males. b. normal females, hemophiliac females, normal males, and hemophiliac males. c. normal females and hemophiliac males d. normal females and normal mates. e. normal females, normal males or hemophiliac males.

Explanation / Answer

In X - linked recessive inheritance males are more prone to disease because they carry the disease trait. If the affected offspring’s mother has brother or father containing the same trait then the mother pass the trait to her offspring. The affected males produce unaffected daughters who can produce 50% affected sons. Hemophilia is the example of X - linked recessive trait.

When a homozygous normal female marries to a normal male the offspring produced are normal females and normal males. Option d is correct.

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