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    Question

    XYZ system of hybrid seed production in wheat was

    proposed by:
    A Driscoll Correct Answer Incorrect Answer
    B Sears Correct Answer Incorrect Answer
    C Rilley Correct Answer Incorrect Answer
    D Ramage Correct Answer Incorrect Answer

    Solution

    The principle of the XYZ system was published by Driscoll (1972). It uses an addition chromosome carrying a gene for pollen fertility and a gene for a phenotype marker – blue coloured aleurone layer.

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