An affected male marries a normal female. The | vedclass

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(A) In this scenario,the father is affected and the mother is normal. All daughters inherit the $X$ chromosome from their father. Since all daughters

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Sex-linked dominant

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(A) In this scenario,the father is affected and the mother is normal. All daughters inherit the $X$ chromosome from their father. Since all daughters are affected,it indicates that the affected gene is located on the $X$ chromosome. Because the father passes his $X$ chromosome to all his daughters and none of his sons,and the trait appears in all daughters but no sons,the trait follows an $X$-linked dominant inheritance pattern. If it were $X$-linked recessive,the daughters would be carriers (if the mother was homozygous normal) and not necessarily affected. Therefore,the gene is $X$-linked dominant.

An affected male marries a normal female. They have three daughters and five sons. All the daughters are affected,and all the sons are normal. The gene for this disease is:

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