A carrier of an X-linked recessive disorder is
Correct answer: B. Female with one affected X
- A. Male with the disorder
- B. Female with one affected X
- C. Female with both X affected
- D. Male without the disorder
Explanation
Carrier females are heterozygous (XAXa) and phenotypically normal but can pass the allele to offspring.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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