When a male child inherits an X-linked disorder from his heterozygous carrier mother:
A) His sons will be carriers.
B) His father has the disorder.
C) Some of his sisters will be carriers.
D) His daughters will have the disorder.
Ans: C
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A male who has a recessive X-linked disorder will have daughters who are carriers and sons who are unaffected. Male children of a carrier mother have a 50% risk of having the disorder and cannot be carriers. Female children of a carrier mother have a 50% risk of being carriers and are not affected by the disorder.
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