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  1. A variant of an organism as defined by differences in its genetic make-up. Each individual organism has one and only one genotype, and humans tend to have unique genotypes (exceptions may be identical twins and if they are ever are cloned). The genotype may or may not be reflected in any change in physical characteristic or behaviour of the organism (phenotype).
  2. Any two alleles inherited for a particular gene. An example is blood groups where two different genotypes, AO and AA, both lead to the same phenotype, blood group A.
This is a disambiguation page.