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AIIMS AIIMS Solved Paper-2004

  • question_answer
    How many different types of gametes can be formed by \[{{F}_{1}}\] progeny, resulting from the following cross? AA BB CC   x   aa  bb  cc

    A)  3            

    B)        8            

    C)  27         

    D)        64

    Correct Answer: B

    Solution :

    Types of gametes \[={{2}^{n}}\] n = number of heterozygotes considered i.e., monohybrid cross (n = 1), dihybrid cross (n = 2), trihybrid cross (n = 3) and so on. AA BB CC x aa bb cc is a trihybrid cross, therefore, different types of gametes are: \[={{2}^{n}}\] \[n=3={{(2)}^{3}}\] \[=2\,\times 2\times 2=8\].


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