Kaplan Nursing Entrance Practice Exam

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What defines incomplete dominance in genetics?

One allele completely masks the other
Both alleles are expressed equally
Both alleles blend to create a new phenotype
Only one allele is expressed

The correct answer is: Both alleles blend to create a new phenotype

Incomplete dominance is a genetic phenomenon where neither allele is fully dominant over the other, leading to a blending of traits. This results in a phenotype that is distinct from both parental alleles. For example, if one parent has red flowers and the other has white flowers, the offspring may exhibit pink flowers, illustrating how the influence of both alleles combines to form a new color. This blending is key to understanding incomplete dominance, as it emphasizes that neither allele is entirely masking the other, nor is there a scenario where one allele is solely responsible for the phenotype. The resultant phenotype is a mixture that reflects the contributions of both alleles, which is essential for defining incomplete dominance.