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).

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). < n.1940
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