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genetic heterogeneity

(jeh-NEH-tik HEH-teh-roh-jeh-NEE-ih-tee)
A term used to describe different genetic mechanisms that produce the same or similar phenotypes. There are two types of genetic heterogeneity: allelic heterogeneity and locus heterogeneity. Allelic heterogeneity occurs when different variants at a single gene locus cause the same or similar phenotypic expressions of a disease or condition. Locus heterogeneity occurs when variants at different gene loci cause the same or similar phenotypic expressions of a disease or condition.
Search NCI's Dictionary of Genetics Terms