| 单词 |
outbreeding |
| 释义 |
ˈoutbreeding, vbl. n.
[f. outbreed v.]
Breeding from parents not closely related.
1901Bull. U.S. Dept. Agric. Div. Veg. Physiol. XXIX. 38 ‘In-and-in breeding’, ‘outbreeding’ and other expressions relating to the close or distant relationship of parents have been prominent subjects among animal breeders. 1902Encycl. Brit. XXV. 372/2 The tribes practised far more in-breeding than outbreeding. 1919East & Jones Inbreeding & Outbreeding i. 13 Interest in the effects of inbreeding and of outbreeding is not confined to the professional biologist. 1940Nature 30 Mar. 485/2 If we are to regard unisexuality simply as one of a number of outbreeding mechanisms, it is necessary to account for the fact that it is frequently found in some groups..but rare in others. 1959C. D. Darlington Darwin's Place in Hist. xii. 70 Outbreeding is necessary for the recombination of differences. 1964E. J. H. Corner Life of Plants xi. 197 Flowers have devices..to carry pollen from one flower to another, and, preferably, from one plant to another, to secure outbreeding. 1967Economist 16 Dec. 1108/2 There is no evidence..that dairy stock are suffering from too close breeding through artificial insemination. Too much out-breeding..would be a more valid criticism. 1975S. K. Jain in Frankel & Hawkes Crop Genetic Resources ii. 22 Many specific genetic factors are known which regulate the degree of outbreeding. |
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