In short horned cattle, genes for red $(R)$ and white $( r )$ coat colour occur. Cross between red $(RR)$ and white $(rr)$ produced $(Rr)$ roan. This is an example of

  • A

    Incomplete dominance

  • B

    Codominance

  • C

    Complementary genes

  • D

    Epistasis

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  • [AIPMT 2010]

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