AA means that a trait is homozygous dominate. A person only has one variation of a gene (trait) and it is dominate.
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In genetics, the notation AA represents a genotype where both alleles at a particular gene locus are the same and are dominant. This means that both copies of the gene are identical and code for the same trait.
two dominant alleles
The probability of offspring for two heterozygous dogs (Aa x Aa) is 25% homozygous dominant (AA), 50% heterozygous (Aa), and 25% homozygous recessive (aa) based on Mendelian genetics principles.
AA would be considered a homozygous genotype because both alleles are the same (in this case, both are "A"). Homozygous means that an organism has two of the same allele for a particular gene.
Heterozygous for the A allele means having one copy of the A allele and one copy of a different allele (e.g., a or B) at a particular gene locus. In genetics, the term heterozygous refers to an individual possessing two different forms (alleles) of a particular gene.
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A homozygous genotype has two identical alleles for a particular gene (e.g. BB or bb), while a heterozygous genotype has two different alleles (e.g. Bb). The notation used to express genotypes includes using uppercase letters for dominant alleles and lowercase letters for recessive alleles (e.g. B for brown eye color and b for blue eye color).