Final answer:
A purebred organism with two identical alleles, either dominant or recessive, is known as homozygous.
Step-by-step explanation:
Another name for a purebred organism, which may have either two dominant alleles or two recessive alleles, is homozygous. This term refers to having two identical alleles for a particular gene. When an organism is homozygous dominant, it possesses two dominant alleles (AA), while a homozygous recessive organism has two recessive alleles (aa). Mendelian genetics states that traits are influenced by alleles, which occur in pairs. The dominant allele is expressed over the recessive allele. In cases where multiple alleles exist for a gene, the wild type (abbreviated as "+") denotes the most common phenotype or genotype among wild animals, considered the standard, with all other forms being variants that may deviate from this standard. Variants can be recessive or dominant to the wild-type allele.