If a man has an X-linked recessive disorder, he will transmit the mutant allele to all daughters, but to no sons.Group of answer choicesTrueFalse
Question
If a man has an X-linked recessive disorder, he will transmit the mutant allele to all daughters, but to no sons.
- Group of answer choices
- True
- False
Solution
Answer
True
Explanation
In X-linked inheritance, males (XY) have one X chromosome and one Y chromosome. Since the gene for the X-linked recessive disorder is located on the X chromosome, a man with this disorder (having the mutated allele on his X chromosome) will pass his Y chromosome to his sons (making them XY), but he will pass his X chromosome (with the mutant allele) to all of his daughters (making them XX). Thus, daughters will inherit the disorder if they also inherit a recessive allele from their mother, whereas sons will not inherit the disorder from their father.
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