What is an example of a homozygous gene pair?

A homozygous gene pair consists of two identical alleles for a particular gene. In the case of the gene pair represented by "AA," both alleles are the same (dominant), making it homozygous. Similarly, "aa" also represents a homozygous condition, but in this case, both alleles are recessive. Therefore, "aa" is a classic example of a homozygous gene pair.

In contrast, a gene pair such as "Aa" is considered heterozygous because it contains one dominant and one recessive allele. The notation "Ab" is not a recognized standard for representing a gene pair, as alleles are typically denoted by a single letter for a gene and its variant. Hence, when focusing on the definition of a homozygous gene pair, "aa" perfectly illustrates the concept of having two identical alleles for a given trait.