| 单词 | forward mutation | 
| 释义 | > as lemmasforward mutation   forward mutation  n. Genetics mutation that results in a change in the original or normal (wild type) phenotype or genotype; an instance of this; cf. earlier back mutation n. at back adj. Additions, reverse mutation n. at reverse adj. and adv. Compounds 2. ΚΠ 1939    Amer. Naturalist 73 313  				Some genes..show more or less equal rates of back and forward mutation. 1956    Brookhaven Symp. Biol. 		(1957)	 8 103  				These studies involve changes occurring in both directions: so-called forward (or direct) mutations from the wild type..to the mutant..phenotype, and back (reverse) mutation from the auxotrophic to the prototrophic phenotype. 1978    Nature 31 Aug. 891/1  				Forward mutations at a variety of loci in rad 1–1 yeast are also subject to photorepair. 2002    Jrnl. Biol. Chem. 277 22345  				The increase in fidelity of the F61A mutant [reverse transcriptase] was corroborated by a 12-fold decrease in its forward mutation rate. < as lemmas | 
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