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    Question

    Awn character in rice (awn & awnless) is an example of ____

    A Duplicate gene action Correct Answer Incorrect Answer
    B Complementary epistatis Correct Answer Incorrect Answer
    C Dominant epistatis Correct Answer Incorrect Answer
    D Supplementary epistatis Correct Answer Incorrect Answer
    E Polymeric gene action Correct Answer Incorrect Answer

    Solution

    When a dominant allele at either of two loci can mask the expression of recessive allele at the two loci, it is known as duplicate gene action. Ex-awn character in rice (awn & awnless). In F2 A-B-(9/16), A-bb(3/16), aaB-(3/16) will develop awn (=15) and only double recessive aabb will be awnless (=1). Thus, the phenotypic ratio will be 15:1.

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