Biology 5090 · O Level · Inheritance

Inheritance — practice question

Within the ABO blood group system, which alleles show codominance?

  • A$I^A$ and $I^B$
  • B$I^A$ and $I^o$
  • C$I^B$ and $I^o$
  • D$I^A$, $I^B$ and $I^o$

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