Individuals that show the recessive phenotype are known to have a homozygous recessive genotype. Each phenotype is based upon the allelic variation within the individual genotype. Molecular biology improved understanding of the relationship between genotype and phenotype. DNA markers are either a genotype or a phenotype. The variant EaEa genotype, homozygous absent, is approximately 1&colon;3200. So a "TT" genotype as well as "TT" and "TT" genotypes will be ticked tabbies. Mutations occurring within this genotype are increasing their pathogenicity. Zygosity may also refer to the origin(s) of the alleles in a genotype. Their phenotype may not be dependent on the equivalence of the genotype. This is because phenotype supervenes on genotype. The color varies according to the genotype (genetic makeup) of the cat. This epigenetic information is complementary to genotype and expression analysis. Monozygotic twins always have the same genotype. These traits arise from the interaction of its genotype with the environment. When a cell splits, two cells of identical genotype result.