The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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44개의 결과 중 1 - 5개
vii 페이지
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close interbreeding , 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 interbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but ...
xii 페이지
... sterility of hybrids , added to and corrected . 267 Pyrgoma found in the chalk . 326 235 377 402 283 440 308 463 505 322 350 Extinct forms serving to connect existing groups . On earth adhering to the feet of migratory birds . On the ...
... sterility of hybrids , added to and corrected . 267 Pyrgoma found in the chalk . 326 235 377 402 283 440 308 463 505 322 350 Extinct forms serving to connect existing groups . On earth adhering to the feet of migratory birds . On the ...
18 페이지
... sterility in species . From the history of the dog , and of some other domestic animals , this conclusion is probably quite correct , if applied to species closely related to each other . But to extend it so far as to suppose that ...
... sterility in species . From the history of the dog , and of some other domestic animals , this conclusion is probably quite correct , if applied to species closely related to each other . But to extend it so far as to suppose that ...
30 페이지
... sterility of hybrids ; but plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change , the accumulative action of Selection , whether applied methodically and ...
... sterility of hybrids ; but plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change , the accumulative action of Selection , whether applied methodically and ...
219 페이지
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close interbreeding , 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 interbreeding , removed by domestication - Laws governing the sterility of hybrids -- Sterility not a special endowment , but ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young