On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
도서 본문에서
43개의 결과 중 1 - 5개
9 페이지
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but ...
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but ...
21 페이지
... Sterility has been said to be the bane of horticulture ; but on this view we owe variability to the same cause which produces sterility ; and variability is the source of all the choicest productions of the garden . I may add , that as ...
... Sterility has been said to be the bane of horticulture ; but on this view we owe variability to the same cause which produces sterility ; and variability is the source of all the choicest productions of the garden . I may add , that as ...
34 페이지
... sterility : from the history of the dog I think there is some probability in this hypothesis , if applied to species closely related together , though it is unsupported by a single experiment . But to extend the hypothesis so far as to ...
... sterility : from the history of the dog I think there is some probability in this hypothesis , if applied to species closely related together , though it is unsupported by a single experiment . But to extend the hypothesis so far as to ...
48 페이지
... sterility of hybrids ; but the cases of plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change I am convinced that the accumulative action of Selection ...
... sterility of hybrids ; but the cases of plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change I am convinced that the accumulative action of Selection ...
218 페이지
... of one general law leading to the advancement of all organic beings , namely , multiply , vary , let the strongest live and the weakest die . CHAPTER VIII HYBRIDISM Distinction between the sterility of first crosses 218 INSTINCT.
... of one general law leading to the advancement of all organic beings , namely , multiply , vary , let the strongest live and the weakest die . CHAPTER VIII HYBRIDISM Distinction between the sterility of first crosses 218 INSTINCT.
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely