* Genotype: The genetic makeup of an organism (e.g., AA, Aa).
* Phenotype: The observable characteristics of an organism (e.g., eye color, height).
* Dominant: A trait that is expressed even when only one copy of the dominant allele is present.
* Recessive: A trait that is only expressed when two copies of the recessive allele are present.
To answer your question, we need more context:
1. What trait are we talking about? Different traits are determined by different genes.
2. Is "A" a dominant or recessive allele? We need to know this to understand how the genotypes relate to the phenotype.
Here's how to think about it:
* If "A" is a dominant allele:
* AA: Will express the dominant phenotype (since it has two copies of the dominant allele).
* Aa: Will also express the dominant phenotype (since it has at least one copy of the dominant allele).
* If "A" is a recessive allele:
* AA: Will express the recessive phenotype (since it has two copies of the recessive allele).
* Aa: Will express the dominant phenotype (since it has at least one copy of the dominant allele).
Example:
Let's say "A" represents the allele for brown eyes, and "a" represents the allele for blue eyes, and "A" is dominant.
* AA: Brown eyes
* Aa: Brown eyes
* aa: Blue eyes
Therefore, without knowing the specific trait and whether "A" is dominant or recessive, we can't definitively say whether "Aa" and "AA" represent a dominant phenotype.