In an X-linked recessive disease, a affected woman married to a normal man, the percentage of affected daughters is:
Correct answer: A. 0%
- A. 0%
- B. 25%
- C. 50%
- D. 100%
Explanation
X chromosome comes from the female and X or Y comes from the man. if the man is normal then the disease will not express in the daughter.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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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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