How is a recessive allele different from a dominant allele? A. Some recessive alleles can show up even if they are not in the genotype. B. A recessive allele does not always determine the trait. C. Only one recessive allele is enough to affect the trait. D. A recessive allele always determines the trait.
Biology · High School · Tue Nov 03 2020
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- The correct statement that distinguishes a recessive allele from a dominant allele is: B. A recessive allele does not always determine the trait.
- In genetics, a dominant allele is one that, when present in the genotype, will always express its associated trait, masking the presence of the recessive allele. On the other hand, a recessive allele will only express its trait when the individual carries two copies of that recessive allele (homozygous recessive).
- Option B correctly reflects the nature of a recessive allele, as its expression requires a specific genotype (homozygous recessive) for the trait to be observed, and it remains hidden or masked in the presence of a dominant allele. Therefore, a recessive allele does not always determine the observed trait; its expression depends on the genetic makeup of the individual.