Explain the difference between complete dominance and codominance. Give an example of each one in order to explain it.

In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype.

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They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).