Kaplan Nursing Entrance Practice Exam 2025 – The All-in-One Guide to Exam Success!

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Which of the following describes blue eye color in terms of genetics?

It is a dominant trait.

It is homozygous dominant.

It is a homozygous recessive trait.

Blue eye color is primarily described as a recessive trait in genetics, which makes the choice of identifying it as a homozygous recessive trait appropriate. In order for an individual to express blue eyes, they must inherit two copies of the recessive allele for eye color, one from each parent.

This means that both alleles must be recessive in the genotype (e.g., "bb"), as opposed to dominant traits, where only one copy of the dominant allele is needed for expression (e.g., "Bb" or "BB"). Therefore, for someone to have blue eyes, they cannot possess a dominant allele that would mask the expression of the recessive allele.

In contrast, dominant traits, such as brown eye color, would require just one copy of a dominant allele to be expressed. Identifying blue eye color as homozygous recessive captures the necessary genetic requirement accurately, reinforcing that it only manifests when both alleles are recessive.

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It results from a dominant allele.

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