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Banking Biology Genetics Question Bank Genetics and Evolution

  • question_answer
    From a cross AABb x aaBb, the genotypes AaBB: AaBb: Aabb: aabb will be obtained in the following ratio

    A)  1:1:1:1            

    B)  1:2:1:0  

    C)  0:3:1:0          

    D)         1:1:1:0

    Correct Answer: B

    Solution :

    AABb \[\times \]aaBb
    AB Ab AB Ab
    aB AaBB AaBb AaBB AaBb
    ab AaBB Aabb AabB AaBB
    ab AaBb AaBb AaBb AaBB
    ab AaBb Aabb AaBb Aabb
    AaBB:AaBb:Aabb:aabb 4   : 8 :   4 : 0 AaBB = 1; AaBb = 2; Aabb = 1; aabb = 0


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