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DUMET Medical DUMET Medical Solved Paper-2011

  • question_answer
    A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc \[\times \]AaBbCc, the phenotypic ratio of the off springs was observed as 1 : 6 : x : 20 : x : 6 : 1 What is the possible value of x?

    A)  3

    B)  9

    C)  15  

    D)  25

    Correct Answer: C

    Solution :

    Polygenes show polygenic inheritance or quantitative inheritance. As genes are present on different chromosomes they will segregate independently during meiosis. Number of individuals in \[{{F}_{2}}={{4}^{n}}\] \[n\] =number of genes present \[={{4}^{3}}=64\] individuals 1 + 6 + 2 \[x\] + 20 + 6 + 1 = 64 \[2x=64-34\] \[x=\frac{30}{2}=15\]


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