* Recessive Alleles: Recessive alleles only express their trait if the organism inherits two copies of that allele (one from each parent).
* Dominant Alleles: If the organism inherits at least one dominant allele for that trait, the dominant allele will mask the expression of the recessive allele.
Example:
* Let's say the trait is eye color, and the recessive allele is "blue eyes" (b).
* The dominant allele is "brown eyes" (B).
* An organism with the genotype Bb will have brown eyes because the dominant allele (B) masks the recessive allele (b).
* Only an organism with the genotype bb (two copies of the recessive allele) will exhibit blue eyes.
In summary: An organism with a recessive allele for a particular trait will only exhibit that trait if it inherits two copies of the recessive allele, one from each parent.
