A hemophilic father can pass the genes of hemophilia to his:
Correct answer: B. Daughters only
- A. Sons only
- B. Daughters only
- C. Both sons and daughters equally
- D. Both sons and daughters in 2:1 ratio respectively
Explanation
The haemophilia gene is on the X chromosome, and a father gives his X to every daughter but his Y to every son, so he can pass the gene to his daughters only. His sons receive their X from their mother, which is why the options including sons are wrong.
This question appeared on the UHS MDCAT 2026 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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