On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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53개의 결과 중 1 - 5개
v 페이지
... hybrids- Sterility various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
... hybrids- Sterility various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
ix 페이지
... hybrids— Sterility various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
... hybrids— Sterility various in degree , not universal , affected by close in- terbreeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
2 페이지
... Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the ... hybrid offspring . It 2 [ CHAP . IX . HYBRIDISM .
... Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the ... hybrid offspring . It 2 [ CHAP . IX . HYBRIDISM .
3 페이지
... hybrid offspring , with the average number produced by both pure parent - species in a state of nature . But causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important ...
... hybrid offspring , with the average number produced by both pure parent - species in a state of nature . But causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important ...
4 페이지
... hybrids in successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that ...
... hybrids in successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings