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HESI A2 Exam Prep 2026

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About Genetics

Codominance occurs when both alleles are fully expressed in a heterozygous organism. Learn how traits like human AB blood type exemplify codominant inheritance.

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Genetics HESI A2 Practice Questions

Free Genetics practice questions for the HESI A2 exam with detailed rationales.

Question 2 of 2

Which of the following best describes codominance?
The phenotype is determined by multiple genes.
The dominant allele completely masks the recessive allele.
Both alleles contribute equally to the phenotype, resulting in a blended trait.
Both alleles are expressed fully and independently in the phenotype.

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