The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 76
... called incipient species , become ultimately converted into good and distinct species which in most cases obviously differ from each other far more than do the varieties of the same species ? How do those groups of species , which ...
... called incipient species , become ultimately converted into good and distinct species which in most cases obviously differ from each other far more than do the varieties of the same species ? How do those groups of species , which ...
Página 156
... called generic characters ; and these characters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less ...
... called generic characters ; and these characters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less ...
Página 493
... called serial homology . The parts which stand in such a relation to each other are said to be homologous , and one such part or organ is called the homologue of the other . In different plants the parts of the flower are homologous ...
... called serial homology . The parts which stand in such a relation to each other are said to be homologous , and one such part or organ is called the homologue of the other . In different plants the parts of the flower are homologous ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor 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