The phenotypic ratio obtained in quantitative inheritance of a dihybrid cross is

  • A

    $1 : 2 : 1$

  • B

    $1 : 4 : 6 : 4 : 1$

  • C

    $1 : 6 : 15\ 20 : 15 : 6 : 1$

  • D

    $9 : 3 : 3 : 1$

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  • [AIPMT 2006]