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Two different alleles of a heterozygous genotype are both fully expressed to produce the phenotype in a type of expression called

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The type of expression where two different alleles of a heterozygous genotype are both fully expressed, resulting in a phenotype where both traits appear simultaneously, is known as "codominance."

In codominance, neither allele is dominant or recessive; instead, both contribute to the organism's phenotype. A common example of codominance can be seen in certain blood types, such as the AB blood type, where both A and B alleles are expressed in the individual. Thus, individuals with this genotype show characteristics of both alleles, presenting a distinct phenotype that reflects the contributions of both alleles rather than a blending of them, which is seen in incomplete dominance.

In summary, codominance is a genetic scenario where both alleles in a heterozygous pair manifest together in the phenotype.

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