variegated position effect

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variegated position effect [′ver·ē·ə‚gād·əd pə¦zish·ən i‚fekt]

(genetics)

A phenomenon observed in some cases when a chromosome aberration causes a wild-type gene from euchromatin to be relocated adjacent to heterochromatin; the phenotypic expression of the wild-type allele will be unstable, producing patches of phenotypically mutant tissue that differ from the surrounding wild-type tissue.

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