The human blood grouping is the ABO system that comprises four types of blood types. The blood proteins a and b in the blood group system are codominant traits. Thus, option C is correct.
Codominant traits are the attributes and characters that are expressed fully in the heterozygotic conditions and are independent of the presence of the other allele or trait.
The blood proteins a and b shows codominance as they both are expressed fully and independently in the presence of each other when together in the AB blood group as, [tex]\rm I^{A}I^{B}[/tex].
Therefore, the A and B protein of the blood group shows codominance.
Learn more about codominant traits here:
https://brainly.com/question/9876643
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