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单词 macromutation
释义

macromutationn.

Brit. /ˌmakrəʊmjuːˈteɪʃn/, U.S. /ˈˌmækroʊmjuˈteɪʃən/
Origin: Formed within English, by compounding. Etymons: macro- comb. form, mutation n.
Etymology: < macro- comb. form + mutation n. Compare micromutation n.
Biology.
A major genetic mutation, esp. as a postulated cause or significant contributory factor in the evolution of new taxa; a mutation which causes a large shift in phenotype.
ΘΚΠ
the world > life > biology > biological processes > genetic activity > [noun] > changes or actions of genes or chromosomes > mutation
sporting of nature1666
sporting1827
saltation1870
mutation1904
point mutation1921
mutation pressure1929
macromutation1940
micromutation1940
mutagenesis1950
1940 R. Goldschmidt Material Basis Evol. iii. 182 Microevolution within the species proceeds by the accumulation of micromutations, in addition to occasional upshoots of local macromutations.
1967 Indian Jrnl. Genetics & Plant Breeding 27 80 Induced macromutations of barley reveal changes in a variety of morphological traits.
1980 S. J. Gould Panda's Thumb (1982) xvii. 188 He admitted that the vast majority of macromutations could only be viewed as disastrous.
1989 Nature 20 Apr. 672/1 Gone are the ideas that..macromutations play a large role in evolution, and that evolutionary trends result from species selection.
This is a new entry (OED Third Edition, March 2000; most recently modified version published online March 2022).
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n.1940
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