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An example of co-dominance is ____________

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An example of co-dominance is ____________

(a) Mouse coat colour

(b) Human ABO blood group system

(c) Human hand size

(d) Human eye colour

I had been asked this question in an interview for job.

The question is from Genes, Chromosomes and Genomes topic in portion Bioenergetics, Enzymes, Metabolism, Genes, Chromosomes and Genomes of Cell Biology

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The correct option is (b) Human ABO blood group system

The best I can explain: When two different alleles are crosses and neither of them is dominant and recessive and both get expressed in the phenotype offspring, then such a genetic scenario is known as codominance. In the ABO Blood group system of humans, a person with A protein has blood type A and a person with B protein has blood type B. If a person with blood type A mates with person with blood type B, then the dominant A and B genes will be co-expressed in the offspring and he will have blood type ‘AB’.

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