Mother and father both have blood group '$A$'. They have two children,one with blood group '$O$' and the second one with blood group '$A$'. They have:

  • A
    mother has homozygotic gene,father has heterozygote $I^A I^A$.
  • B
    both are homozygotic $(I^A I^A)$.
  • C
    mother is heterozygotic $(I^A i)$ and father is homozygotic $(I^A I^A)$.
  • D
    both are heterozygotic $(I^A i)$.

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