The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2 |
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Página 5
ten generations , yet he asserts positively that their fertility never increases , but
generally decreases greatly and suddenly . With respect to this decrease , it may
first be noticed that when any deviation in structure or constitution is common to ...
ten generations , yet he asserts positively that their fertility never increases , but
generally decreases greatly and suddenly . With respect to this decrease , it may
first be noticed that when any deviation in structure or constitution is common to ...
Página 12
From this absolute zero of fertility , the pollen of different species applied to the
stigma of some one species of the same genus , yields a perfect gradation in the
number of seeds produced , up to nearly complete or even quite complete fertility
...
From this absolute zero of fertility , the pollen of different species applied to the
stigma of some one species of the same genus , yields a perfect gradation in the
number of seeds produced , up to nearly complete or even quite complete fertility
...
Página 16
These facts show how completely the fertility of a hybrid may be independent of
its external resemblance to either pure parent . Considering the several rules
now given , which govern the fertility of first crosses and of hybrids , we see that ...
These facts show how completely the fertility of a hybrid may be independent of
its external resemblance to either pure parent . Considering the several rules
now given , which govern the fertility of first crosses and of hybrids , we see that ...
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Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or, The ..., Volumen1 Charles Darwin Vista de fragmentos - 1972 |
The Origin of Species by Means of Natural Selection: Or, the Preservation of ... Charles Darwin Sin vista previa disponible - 2016 |
Términos y frases comunes
according admit affinity allied America ancient animals appear areas become believe belonging birds cause certain changes characters climate closely common complex considered continent crossed deposited descended difficulty distant distinct species doubt effects embryo Europe evidence existing explained extent extinct extremely fact families fertility flowers follow formations former formerly forms fossils genera genus geological give given Glacial groups habits hand hybrids important individuals inhabitants inherited insects instance intermediate intervals islands kinds known land less living look mammals manner means migration modified mountains namely natural selection naturalists nearly occur oceanic offspring organs parent perfect period plants points present probably produced progenitor range recent regions remains remarked resemblance respect rudimentary seeds seems separated similar single South stage sterility structure successive suppose theory variations varieties various whole widely
Información bibliográfica
| Título | The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2 The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Charles Darwin, ISBN 0404084001, 9780404084004 Volúmenes4-5 de Works, Charles Darwin |
| Autor | Charles Darwin |
| Edición | reimpresa |
| Editor | AMS Press, 1972 |
| Procedencia del original | Universidad de Minnesota |
| Digitalizado | 22 Mayo 2018 |
| ISBN | 0404084044, 9780404084042 |
| Exportar cita | BiBTeX EndNote RefMan |