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CODOMINANCE

-A condition in which the alleles of a gene pair in a heterozygote are fully expressed thereby resulting in offspring with a phenotype that is neither dominant nor recessive.

- is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked. In codominance, however, neither allele is recessive and the phenotypes of both alleles are expressed.
EXAMPLE
Do you know your blood type? Blood types are excellent examples of codominance. A person's blood type can be A, B, AB, or O. The letters refer to the type of proteins present in the blood. If a person has the type A protein they have type A blood. If a person has the type B protein they have type B blood. If a person has type O blood then neither protein is present. If a person is type AB then they have both A and B proteins present in their blood. If a person is type A or type B this means that they have the dominant A or dominant B allele present in their blood. All other alleles are masked. If a person is type O it means that neither the type A or type B allele is dominant. However, if a person is type AB this means that both the A allele and the B allele are equally expressed and are therefore codominant.
FRANCESSE RAMIREZ
FRANCIS BARRAMEDA

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