A male with an X-linked recessive disorder mates with a female who is a carrier for this same X-linked recessive disorder. Which of these is the correct expected frequency of this disorder in their children?
A. 50% frequency in the sons
B. 50% frequency in the daughters
C. 50% frequency in both the sons and the daughters
D. 100% frequency in the sons
Answer: A. 50% frequency in the sons
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