A trait that is expressed only when both alleles are recessive is called?

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Prepare for the West-MEC RMA-AMT Module 1 Exam. Use flashcards and multiple-choice questions with hints and detailed explanations to enhance your study experience. Gain confidence and be ready for your exam!

Multiple Choice

A trait that is expressed only when both alleles are recessive is called?

Explanation:
Traits are determined by pairs of alleles. If a trait appears only when both alleles are recessive, the dominant allele masks it whenever a dominant is present. That means the recessive allele must be paired with another recessive allele to be expressed, which is exactly what a recessive gene describes. The other terms don’t fit this pattern: a dominant gene produces the trait with at least one dominant allele, an X-linked gene refers to location on the X chromosome, and codominant means both alleles contribute to the phenotype.

Traits are determined by pairs of alleles. If a trait appears only when both alleles are recessive, the dominant allele masks it whenever a dominant is present. That means the recessive allele must be paired with another recessive allele to be expressed, which is exactly what a recessive gene describes. The other terms don’t fit this pattern: a dominant gene produces the trait with at least one dominant allele, an X-linked gene refers to location on the X chromosome, and codominant means both alleles contribute to the phenotype.

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