Dictionary of Human Evolution and Biology

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Codominant Pattern Of Inheritance

In Mendelian genetics, a system of inheritance in which, when one allele of any ancestral homozygote mutates to form a new heterozygote, the phenotype of that heterozygote is distinguishable from both the ancestral and subsequent new homozygote. In such cases, the ancestral homozygote is termed AA, and the de novo heterozygote is termed AB, with B now used to symbolize the new codominant mutant and BB the other homozygote. The phenotype of the distinguishable heterozygote is intermediate. In humans, the A and B alleles in the ABO blood groups interact in a codominant fashion.

See dominant pattern of inheritance, recessive pattern of inheritance, and incomplete dominance.

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