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Cleanliness in relation to a specific characteristic. A diploid organism has two copies of each gene (usually one from each parent). The variants of a gene are called alleles. If both alleles of an individual are identical for a particular trait, the genome is called homozygous or homozygous with respect to that trait. If, on the other hand, two different alleles are present, this is referred to as heterozygosity or heterozygosity.