In shorthorn cattle genes for red $(r_1)$, and white $(r_2)$ coat colour occur. Crosses between red $(r_1r_2)$ and white $(r_2r_2)$ produced $(r_1r_2)$ roan. This is an example of

  • A

    Complementary genes

  • B

    Epistasis

  • C

    Codominance

  • D

    Incomplete dominance

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Give differences : Incomplete dominance and Co-dominance
 

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