Genetic Terms

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Codominant

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A situation in genetics where both alleles in a gene pair are fully expressed in a heterozygote, resulting in a phenotype that is neither dominant nor recessive.

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Epistasis

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A genetic interaction where the effect of one gene is modified by one or several other genes, which are sometimes called modifier genes.

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Expressivity

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The degree to which a genotype is expressed in an individual's phenotype, varying among individuals with the same genotype.

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Incomplete Dominance

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A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype.

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Phenocopy

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An environmentally induced phenotype that resembles the phenotype produced by a specific genotype.

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Recombinant

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An organism or cell in which genetic recombination has occurred, resulting in a new combination of genes.

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Genetic Heterogeneity

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A phenomenon where a single phenotype or genetic disorder may be caused by any one of a multiple number of alleles or non-allele mutations.