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AIIMS AIIMS Solved Paper-2005

  • question_answer
    Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny is 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 characterised by occurrence of intermediate forms between the parental type. In case of crossing between AABBCC (dark colour) and aabbcc (light colour) in \[{{F}_{2}}\] 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 \[{{F}_{2}}\] generation would be 3.12 i.e., less than 5%.


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