Mother and father both have blood group $‘A’$. They have two children one with blood group $‘O’$ and second one with blood group $‘A’$. They have

  • [AIIMS 2009]
  • A

    mother has homozygotic gene father has heterozygote $I'^A \,I^A$.

  • B

    both are homozygotic $(I^AI^A)$

  • C

    mother is heterozygotic $(I^Ai)$ and father is homozygotic $(I^AI^A)$

  • D

    both are heterozygotic $(I^Ai)$

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