Consider the following statement regarding $ABO$ blood group in human

$I.$ It is controlled by multiple allele

$II.$ It shows codominance

$III.$ Codominance can be manifested phenotypically in human

$IV.$ It follows the Mendel law of inheritance

Which of the following statements (s) are correct?

  • A

    Only $I$ is correct

  • B

    $I$ and $II$ are correct

  • C

    $II$ and $III$ are correct

  • D

    $IV$ and $II$ are correct

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  • [NEET 2020]

Blood group $‘B'$ will have alleles