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Homozygous What is it? An organism is homozygous if it has the same allele on both of its homologous chromosomes. Give me an example! Let's say we are looking at the gene that controls the organism's height, and we will assume there are two versions of this gene, or two alleles: T = the tall allele, and t = the short allele. A homozygous individual would either be TT or tt. Copyright ©2010, PCS Edventures, Inc. All Rights Reserved.