Codominance. The dominance in which the two alleles or traits of the genotypes (of both homozygotes) are displayed simultaneously in offspring is referred to as codominance (phenotype). In cross-breeding, neither a dominant nor a recessive allele exists.
A gene is a segment of DNA or RNA that controls a certain trait. Genes are subject to mutation and can exist in two or more distinct forms; an allele is one of these forms.
Inheritance of the ABO blood type is autosomal dominant. The O allele is recessive and the codominant alleles are A and B.
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