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| Codominance |
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| Co-dominance represents a situation where two allelic genes when present together in an individual, express their traits independently instead of showing a typical dominant recessive relationship. As a result the heterozygous progeny of the F2 generation show a phenotype that is different from both the homozygous parent. |
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| A classical example of codominance is the expression of blood group AB. The genotype for this blood group is IA Ib. Each of the two genes produces the respective antigen and neither of them checks the expression of the other. |
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