In a cross between white-flowered parents, $F_1$ progeny was uniformly purple-flowered. The $F_2$ progeny showed a phenotypic ratio $9 : 7$ between purple-flowered and white-flowered plants. The above result indicates that the flower colour is controlled by

  • A

    Two alleles

  • B

    One allele

  • C

    Three alleles

  • D

    Four alleles

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