| up promoter mutation | A mutation that increases the frequency of initiation of transcription. (05 Mar 2000) |
|---|---|
| forward mutation | Any mutation which renders a formerly functional gene nonfunctional. Compare: back mutation. (09 Oct 1997) |
| lethal mutation | <genetics, molecular biology> Mutation that eventually results in the death of an organism carrying the mutation. (18 Nov 1997) |