Incomplete Dominance and Codominance

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Incomplete Dominance and Codominance

Incomplete Dominance Incomplete dominance is an interaction between two alleles that are expressed more or less equally, and the heterozygote is different from either homozygous. Example: In cattle, the alleles for red coat color and for white coat color interact to produce an intermediate coat color called roan

Codominance: Codominance is similar to incomplete dominance in that there is no dominant allele. However, the phenotypic expression is quite different. If two alleles have a codominance relationships, in the heterozygote both alleles will be completely expressed.

ABO blood types, the IAIB heterozygote expresses both alleles Codominance Codominance occurs when the heterozygote expresses the phenotype of both homozygote. Example: ABO blood types, the IAIB heterozygote expresses both alleles Sickle cell anemia in heterozygous condition