close breeding 中文意思是什麼
close breeding
解釋
近親繁殖。-
We have been proposing to close the island during the breeding season
不過從以上情況看來還可以多做一點。 -
Twenty f1 combinations crossed among 5 varieties and strains different in fiber properties according to complete diallel crossing design were used to evaluate the heterosis and gene action of boll weight and lint percentage in high quality fiber property varieties in upland cotton in 1998 1999 for two year successively at nanjing. it was indicated that there existed small interactions with the environmental factors without maternal effects and the additive gene effect was in chief, attaining to 51. 2 % and 65. 4 % respectively for boll weight and lint percentage. the dominant effect was also in higher rate, 32. 6 % and 16. 8 % respectively. the population mean heterosis of boll weight and lint percentage over the mid - parental mean were relatively prominent 13. 3 % and 3. 5 % respectively in extreme significance. however, boll weight showed no significantly surpassing parental f1 heterosis over the better parent based on population mean ( 2. 0 % ) ; while the lint percentage expressed significant negative heterosis value ( - 2. 1 % ). the gene actions were in conformity with the heterosis expression. it was shown clearly that the f1 combinations crossed between parents with similar performances had relatively high dominant effects and significant positive f1 surpassing parental heterosis ( f1 heterosis over the better parent ) ; while no f1 combination crossed between the parents with prominent mutual difference surpassed the higher parent in yield components, which indicated that among those parents with less difference and close relationships, there still existed sufficient genetic variation or certain mechanism for creating variation and achieving greater advances in breeding. correlation analyses also indicated that there still existed severely undesirable negative correlation between yield and fiber properties as well as the difficulties for their simultaneous improvements
利用5個具有不同纖維品質性狀的品種（系）配製完全雙列雜交組合20個，通過親本和f1的2年隨機區組試驗發現產量性狀的鈴重和衣分與環境的互作效應小，不存在母體效應，並以加性遺傳效應為主，分別占表型方差的51 . 2 %和65 . 4 % ;顯性遺傳效應所佔的比率也較高，分別為32 . 6 %和16 . 8 % .鈴重和衣分的群體平均優勢較大，分別為13 . 3 %和3 . 5 % ，達到了極顯著;鈴重的超親優勢為2 . 0 % ，不顯著;衣分為顯著的負值（ - 2 . 1 % ） .遺傳分析與雜種優勢結果一致.具體表現在產量性狀上，親本相當配製的組合雜合顯性較高，其超親優勢正向顯著，而極值親本（差異較大）所配組合沒有超過高親的.這表明親本差異小、親源關系較近的親本中仍然存在足夠的遺傳變異或某種機制以創造變異使育種取得更大的進展.相關分析表明了仍然存在嚴重的品質與產量的負相關，遺傳改良的難度較大 -
Although breeding between close kin is thought to be generally unfavorable from an evolutionary standpoint, in part because harmful mutations are more easily propagated through populations in this way, theory predicts that under some circumstances, the benefits of inbreeding may outweigh the costs
盡管從進化的角度看來近親繁殖通常是不利的，部分原因是近親繁殖使有害突變更易在種群內傳播，但是理論預測，在某些情況下近親繁殖利大於害。 -
All wholesale fish markets are thoroughly cleaned immediately after close of trade with empty containers and refuse removed. petroleum oil is applied to drains to prevent breeding of mosquitoes
魚類批發市場工作人員在批銷活動結束后，隨即進行徹底清潔工作，清理空置的容器和垃圾，亦在排水道施用蚊油，防止蚊蟲滋生。 -
Innovation in product of investment fund breeding some purposes and deep background connects close with the changes of economic and financial environment and market demand, which has also a close relationship with epoch, investors " preferences, degree of perfection and openness, substitution product of financial investment and innovation in financial instrument continuously emerging in international markesu. v birth of any new fund product reflects character of epoch and is the result of it
投資基金的品種創新是出於一定的動機並有著深刻的背景，與經濟、金融環境變化以及市場需求密切聯系著，也與時代、投資者的偏好、市場完善與開放程度、金融投資替代產品和國際上不斷出現的金融工具創新密切相關。每一個基金新品種的出現，都打上了時代的烙印，都是時代的產物。
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