$ABO$ blood groups in humans are controlled by the gene $I$. It has three alleles ­$ I^A, I^B$ and $i$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

  • [AIPMT 2010]
  • A

    Three

  • B

    One

  • C

    Four

  • D

    Two

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  • [AIPMT 2001]