In man, four phenotypes of blood groups are due to the presence of antigen-$A$ and antigen-$B$ on the $RBC.$ The chromosome that has the gene to control these antigens is

  • A

    $X$-chromosome

  • B

    $21^{\text {st }}$ chromosome

  • C

    $9^{\text {th }}$ chromosome

  • D

    $7^{\text {th }}$ chromosome

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