| 单词 | back mutation |
| 释义 | > as lemmasback mutation back mutation n. [ < back n.1 + mutation n. 5c] Phonology In Old English, a change in the sound of the vowels æ, e, i, which were diphthongized to ea (= æa), eo, io, when a back vowel stood in the following syllable.extracted from backadj.back mutation back mutation n. Genetics = reverse mutation n. at reverse adj. and adv. Compounds 2. ΚΠ 1927 Proc. Cambr. Philos. Soc. 23 842 It [sc. mutation] is also more effective than selection in weeding out rare recessives, provided that it is not balanced by back mutation of dominants. 1946 Cold Spring Harbor Symposia on Quantitative Biol. 11 216 It is not experimentally possible to distinguish a back-mutation from a suppressor mutation in one of a series of adjacent leucineless genes. 1986 R. F. Doolittle Urfs & Orfs i. 10 Any position can be subject to reverse changes (‘back-mutations’) and multiple hits. 2001 Human Genetics 108 167 The normal alleles must have arisen by back mutation in a precursor cell. < as lemmas |
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