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back mutation

noun Genetics.

a mutation of an existing mutant gene that restores it to its previous form.

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Origin of back mutation

First recorded in 1935–40
Also called reverse mutation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for back mutation

back mutation

noun

genetics the reversion of a mutant to the original phenotype
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012