The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Выпуск 5D. Appleton, 1896 |
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... 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 incidental on other differences , not ...
... 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 incidental on other differences , not ...
Стр. 1
... 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 incidental on other differences ...
... 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 incidental on other differences ...
Стр. 2
... Hybrids , on the other hand , have their reproductive organs functionally impotent , as may be clearly seen in the ... hybrid offspring . It is 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 is 2 [ CHAP . IX . HYBRIDISM .
Стр. 3
... 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 ...
Стр. 4
... 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 ...
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 2 Charles Darwin Полный просмотр - 1888 |
The Origin of Species by Means of Natural Selection, Or, The ..., Том 2 Charles Darwin Полный просмотр - 1896 |
The Origin of Species by Means of Natural Selection, Or, The ..., Том 2 Charles Darwin Полный просмотр - 1896 |
Часто встречающиеся слова и выражения
accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become beds believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo 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 mammæ mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation paleozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings