What will be the percentage of sons having a normal vision if the father has normal vision and their mother is colour blind?(a) 0%(b) 25%(c) 50%(d) 100%The question was posed to me during an online interview.The query is from Inheritance and Variation Principles topic in section Principles of Inheritance and Variation of Biology – Class 12

What will be the percentage of sons having a normal vision if the fath

1.	What will be the percentage of sons having a normal vision if the father has normal vision and their mother is colour blind?(a) 0%(b) 25%(c) 50%(d) 100%The question was posed to me during an online interview.The query is from Inheritance and Variation Principles topic in section Principles of Inheritance and Variation of Biology – Class 12
Answer» The correct OPTION is (a) 0% For explanation I would say: The percentage of sons having normal vision, if the FATHER has normal vision and mother is colour blind is 0% because as colour blindness is a sex-linked TRAIT, it MEANS that the trait only transmits through X-chromosome. As the mother is colour blind, both her gametes will carry the gene for colour blindness, so none of their sons will have a normal vision.

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