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ABO blood group system in human beings is an example of codominant, dominant recessive and multiple alleles. Blood groups are controlled by the gene I located on 9th chromosome that has 3 multiple alleles, out of which any two are found in a person. In codominance, both genes express themselves completely.

1. ABO blood group system in human beings is an example of codominance.
2. Blood groups are controlled by the gene I located on 9th chromosome.
3. The gene I has 3 multiple alleles, out of which any two are found in a person.
4. In codominance, both genes express themselves completely.

Correct answer: ABO blood group system in human beings is an example of codominance.

Solution

ABO blood groups are a classic example of codominance because in the AB phenotype, both A and B alleles are expressed fully. The other options are supporting facts about the system, not the main example asked for.

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