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The ABO blood-group system is an example of
Asingle-allele inheritance
Btwo-allele Mendelian dominance only
Cmultiple alleles with co-dominance
Dadditive polygenic inheritance
Answer & Solution
Correct answer: C. multiple alleles with co-dominance
The ABO locus has three alleles (I^A, I^B, i) in the population — multiple alleles. I^A and I^B are co-dominant with each other, while both are dominant over i. Each individual still carries only two alleles.
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