The sickle-cell mutant allele and wild-type β-globin allele are codominant.

Name: The sickle-cell mutant allele and wild-type β-globin allele are codominant.
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Codominance is when both alleles are expressed in the heterozygous phenotype. In sickle-cell anemia, the mutant allele and wild-type β-globin allele are both expressed, leading to the characteristic sickle shape of red blood cells in affected individuals. Therefore, the sickle-cell mutant allele and wild-type β-globin allele are codominant.

The Sickle-Cell Mutant Allele and Wild-Type β-Globin Allele Are Codominant