Match following pair.

 

726-768

  • A

    $x$ - human, $y$ - drosophila

  • B

    $x$ -drosophila, $y$ - hen

  • C

    $x$ - hen, $y$ - human

  • D

    $x$ -drosophila, $y$ - human

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Definitions / Explanation : Sex determination
 

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  • [AIPMT 1997]

Sex of a human child is determined by