How is a recessive allele expressed?
Understand the Problem
The question is asking for an explanation of how a recessive allele is expressed in genetic terminology. It presents multiple choice options, focusing on the relationship between recessive and dominant alleles.
Answer
A recessive allele is expressed when an individual has two copies, one from each parent.
A recessive allele is expressed only if an individual inherits two copies of the allele, one from each parent. If only one copy is present, the individual is usually a carrier but does not express the trait associated with that allele.
Answer for screen readers
A recessive allele is expressed only if an individual inherits two copies of the allele, one from each parent. If only one copy is present, the individual is usually a carrier but does not express the trait associated with that allele.
More Information
Recessive alleles lead to traits or conditions that might not be visible unless two copies are present. They can be passed onto offspring even if not expressed in the parent.
Tips
A common mistake is assuming a recessive trait will be expressed with just one recessive allele. It requires two recessive alleles.
Sources
- What are Dominant and Recessive? - Learn Genetics Utah - learn.genetics.utah.edu
- Recessive Traits and Alleles - genome.gov
- Recessive allele - Genomics Education Programme - genomicseducation.hee.nhs.uk
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