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If both mother and father are AB blood group then child can never be

Question and options

If both mother and father are AB blood group then child can never be
  1. A
  2. B
  3. AB
  4. O

Answer and explanation

Correct answer: D - O
AB x AB parents give children of genotype AA, AB or BB (groups A, AB, B); neither parent carries O, so the child can never be O.

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