Which of the following best describes a recessive allele?
Correct Answer: A recessive allele is expressed only when two copies are present.
- Step 1: Understand what an allele is. An allele is a version of a gene that can determine a specific trait.
- Step 2: Learn about dominant and recessive alleles. A dominant allele can mask the effect of a recessive allele.
- Step 3: Know that a recessive allele is not expressed if a dominant allele is present. It only shows up when there are two recessive alleles.
- Step 4: Realize that having two copies of the recessive allele is called being homozygous for that allele.
- Step 5: Conclude that a recessive allele is expressed in the phenotype (the observable traits) only when an individual has two copies of it.
No concepts available.
