Codominance is a heterozygous condition in which both alleles at a gene locus are fully expressed in the phenotype.In codominance, neither phenotype is completely dominant. This phenomenon is commonly seen in ABO blood group system. When any other blood group (A, B or AB) is crossed with O blood group, then the phenotypic ratio is obtained as 1:1. Both the genes are equally expressed.
Thus, the correct answer is option C.
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