A couple comes to your genetic counseling clinic concerned that they might have a second child affected with the same X-linked recessive disease displayed by their son. Neither of the parents displays the trait. What do you tell them?
a. Because it's a recessive trait, they must both be carriers.
b. Because it's a recessive trait, only the father could pass the gene to the next offspring.
c. They have a chance of having another affected son.
d. They are not at risk of having another affected child.
Answer: C
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