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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vii 페이지
... degree , not universal , affected by close interbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by natural ...
... degree , not universal , affected by close interbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences , not accumulated by natural ...
9 페이지
... degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable physiological ...
... degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable physiological ...
10 페이지
... degree , to the males alone . A much more important rule , which I think may be trusted , is that , at what- ever period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though ...
... degree , to the males alone . A much more important rule , which I think may be trusted , is that , at what- ever period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though ...
11 페이지
... degree in some one part , both when compared one with another , and more especially when compared with the species under nature to which they are nearest allied . With these exceptions ( and with that of the perfect fertility of ...
... degree in some one part , both when compared one with another , and more especially when compared with the species under nature to which they are nearest allied . With these exceptions ( and with that of the perfect fertility of ...
15 페이지
... degree of divergence and relative size of the two arms of the furcula . The proportional width of the gape of mouth , the proportional length of the eyelids , of the orifice of the nostrils , of the tongue ( not always in strict ...
... degree of divergence and relative size of the two arms of the furcula . The proportional width of the gape of mouth , the proportional length of the eyelids , of the orifice of the nostrils , of the tongue ( not always in strict ...
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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