If a normal person marries with colour blind female what will be the possibility of normal male child:
Correct answer: A. 0%
- A. 0%
- B. 25%
- C. 50%
- D. 75%
Explanation
A colour blind mother carries the defective allele on both her X chromosomes, and a son receives his only X from her, so every son must be colour blind. The daughters each receive a normal X from the father and are carriers with normal vision. This is the clearest illustration of why an X linked recessive trait passes from mother to son.
This question appeared on the UHS MDCAT 2025 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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