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Dominance - the phenomenon whereby, in an individual containing two allelic forms of a gene, one is expressed to the exclusion of the other. Codominance - 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. Incomplete dominance - is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles. Unlike in complete dominance inheritance, one allele does not dominate or mask the other allele. Incomplete dominance occurs in the polygenic inheritance of traits such as eye color and skin color. Multiple alleles - three or more alternative forms of a gene (alleles) that can occupy the same locus. However, only two of the alleles can be present in a single organism. For example, the ABO system of blood groups is controlled by three alleles, only two of which are present in an individual. #dominance #codominance #phenotypes #Allele #recessive #incompleteDominance #polygenic #MultipleAlleles #gene
