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NEET Biology Principle Of Inheritance And Variation Question Bank Sex Linked Inheritance

  • question_answer
    A girl of normal vision whose father was colourblind marries a man of normal vision whose father was also colourblind. Their sons would be (of total number of sons) [MP PMT 1995]

    A)   All colourblind

    B) 50% colourblind

    C) All normal

    D) 25% colourblind

    Correct Answer: B

    Solution :

    Infact the girl with normal vision is carrier because her father is colourblind (daughter of colourblind father are either colourblind or carrier) and when she marries a normal man the possibility of their sons being colourblind is 50% because the genotype of parents is X?X and XY, so only half of the possible combinations of XY have the X-linked recessive genes which exhibit the disease.


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