Describe the alleles of a homozygous individual:

A homozygous individual has two identical alleles for a particular gene. This means that both copies of the allele, one inherited from each parent, are the same—either both are dominant or both are recessive. For instance, if the gene is responsible for flower color, a homozygous individual could have two alleles for red flowers or two for white flowers. This uniformity in the alleles leads to the individual expressing that trait consistently.

In contrast, if an individual had two different alleles, they would be classified as heterozygous. For alleles that are one dominant and one recessive, the dominant trait would be expressed, but this would also indicate a heterozygous condition, which is different from being homozygous. The option indicating that an individual has no alleles is not applicable, as all individuals possess alleles for the genes they carry. Thus, the correct characterization of a homozygous individual is that they possess two of the same allele.