reverse mutation

synonym: back mutation
https://doi.org/10.1351/goldbook.16054
Mutation in a mutant allele which makes it capable of producing the nonmutant phenotype; this may result from restoration of the original DNA sequence of the gene or from production of a new DNA sequence which has the same effect.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1302 [Terms] [Paper]