Humber Admissions Practice Test

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In codominance, how are the alleles expressed?

Both alleles are completely suppressed
Only one allele is expressed at a time
Both alleles are fully expressed simultaneously
Only the dominant allele is expressed

The correct answer is: Both alleles are fully expressed simultaneously

In codominance, both alleles are fully expressed simultaneously in the phenotype of the organism. This means that neither allele completely masks the other, resulting in a phenotype that showcases the traits associated with both alleles. A classic example of codominance is seen in certain blood types, such as AB blood type, where both A and B alleles are expressed fully in the presence of each other, leading to the distinct AB phenotype rather than a blend or one being dominant over the other. This clear manifestation of both traits helps illustrate the unique relationship between alleles in codominance, highlighting the genetic diversity within species.