Final answer:
An organism that has two identical alleles for a trait is homozygous for that trait.
Step-by-step explanation:
An organism that has two identical alleles for a trait is homozygous for that trait. When an organism is homozygous, it means it has two of the same alleles for a specific gene. For example, if an organism has two dominant alleles (AA) or two recessive alleles (aa), it is homozygous for that trait.