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J & K CET Medical J & K - CET Medical Solved Paper-2013

  • question_answer
    A man, whose father is colourblind, marries a lady who is daughter of a colour blindman. Their off springs will be

    A)  all normal

    B)  all colourblind

    C)  all sons colourblind

    D)  some sons colourblind and some normal

    Correct Answer: C

    Solution :

     Woman is a carrier of gene since her father was colourblind. The gene for colour blindness is recessive and carried on the X-chromosomes \[{{X}_{c}}\]stands for the X-chromosome carrying the colour, blindness gene.
    \[X\] \[{{X}_{c}}\]
    \[{{X}_{c}}\] \[X{{X}_{c}}\] \[{{X}_{c}}{{X}_{c}}\]
    \[Y\] \[XY\] \[{{X}_{c}}Y\]
    A normal man and carrier wiman offspring will be 50% colourblind sons and 50% daughter are carries ofdisease.


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