In genetics, what pattern of inheritance is illustrated by the human ABO blood group system?

Answer and explanation

Correct answer: D. Multiple alleles and codominance

  1. Step 1: ABO blood groups involve three alleles (), where and are codominant with each other and dominant over . Answer: Multiple alleles and codominance. Why not the others: Incomplete dominance yields intermediate blended phenotypes like pink snapdragons.

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