Both an individual's genotype and phenotype differ from every other individual's genotype and phenotype (except for genotypes in the case of identical twins).

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An individual's genotype is unique due to the combination of alleles inherited from their parents, and their phenotype is influenced by both their genotype and environmental factors. Identical twins share the same genotype but can have different phenotypes due to environmental influences.

Both an Individual's Genotype and Phenotype Differ from Every Other