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AIIMS AIIMS Solved Paper-2008

  • question_answer
    Grain colour in wheat is determined by three pairs of polygere. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny if likely to resemble either parent?

    A) Half                       

    B)        Less than 5 percent

    C)  One third        

    D)  None of these

    Correct Answer: B

    Solution :

    Polygene results in quantitative inheritance, which is characterized by occurrence of intermediate forms between the parental type. In case of crossing between AABBCC (dark colour) and aabbcc (light colour), in F2 generation seven phenotypes will obtain with ratio of 1 : 6 : 15 : 20 : 15 : 6 : 1. The total number of progeny is 64, out of which only two will be likely resemble with either parents. Hence, their proportion in F2 generation would be 3.12, ie, less than 5%.


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