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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

      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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