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  4. In humans, the dominance relationship between the A and B alleles of the ABO blood group gene is an example of

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Q. In humans, the dominance relationship between the A and B alleles of the ABO blood group gene is an example of

Principles of Inheritance and Variation

Solution:

Codominance is the phenomenon of two alleles lacking dominant recessive relationship and both express themselves in the organisms. The codominant alleles are able to express themselves independently when present together. ABO blood groups are controlled by the gene I. Gene I has three alleles $I ^{ A }, I ^{ B }$ and $i$.