Locus heterogeneity is a single disorder, trait, or pattern of traits caused by mutations in genes at different chromosomal loci. For example, retinitis pigmentosa has autosomal dominant, autosomal recessive, and X-linked origins. However, only one mutant locus is needed for the phenotype to manifest. Other examples are hypertrophic cardiomyopathy, osteogenesis imperfecta, Familial hypercholesterolemia.
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Locus heterogeneity Wikipedia(Text) CC BY-SA