If a normal person marries with colour blind female what will be the possibility of normal male child:

  • 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.

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