Codominant Alleles

If two alleles are present and they both act as dominants and affect the same phenotype, then they are called codominants.

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The offspring have a new phenotype with a mix of feature A and feature B. when these are bred together we get:

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The ratio of the phenotypes will be 1 type A : 2 type AB : 1 type B. In this case the heterozygote is clearly different and no backcross is needed to find the organisms with mixed alleles.