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back mutation

noun, Genetics.
1.
a mutation of an existing mutant gene that restores it to its previous form.
Also called reverse mutation.
Origin
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for back-mutation

back mutation

noun
1.
(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
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Contemporary definitions for back-mutation
noun
Dictionary.com's 21st Century Lexicon
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