The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life and The Descent of Man and Selection in Relation to SexModern library, 1936 - 1000 páginas |
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Página 215
... genus Verbascum , can be united with unusual facility , and produce numerous hybrid offspring , yet these hy- brids are remarkably sterile . On the other hand , there are species which can be crossed very rarely , or with extreme ...
... genus Verbascum , can be united with unusual facility , and produce numerous hybrid offspring , yet these hy- brids are remarkably sterile . On the other hand , there are species which can be crossed very rarely , or with extreme ...
Página 324
... genus with the parent A ; or those from I , with the par- ent I. But the existing genus F14 may be supposed to have been but slight- ly modified ; and it will then rank with the parent - genus F ; just as some few still living organisms ...
... genus with the parent A ; or those from I , with the par- ent I. But the existing genus F14 may be supposed to have been but slight- ly modified ; and it will then rank with the parent - genus F ; just as some few still living organisms ...
Página 655
... genus . The sexes in these three cases have thus been rendered nearly alike , though in an opposite manner . In the allied genus Eubagis , both sexes of some of the species are plain - coloured and nearly alike ; whilst with the greater ...
... genus . The sexes in these three cases have thus been rendered nearly alike , though in an opposite manner . In the allied genus Eubagis , both sexes of some of the species are plain - coloured and nearly alike ; whilst with the greater ...
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Términos y frases comunes
acquired adult allied apes appear beak beautiful become believe birds breeds cause characters civilised closely colour common confined crossed crustaceans degree descended developed distinct species domestic doubt eggs existing extinct extremely fact favourable feathers female fertility fishes formation forms Fritz Müller genera genus given gradations greater number groups habits Hence hybrids important individuals inhabitants inherited insects instance instincts intermediate islands kind larvæ latter Lepidoptera less likewise living lower animals Malay Archipelago males mammæ mammals manner Marsupials modified monkeys natural selection naturalists nearly nest observed ocelli offspring organs Origin of Species ornaments perfect period pigeons plumage pollen present probably produced progenitor quadrupeds races Red Grouse relation remarks resemble rudimentary seeds sexes sexual selection shew shewn slight South America sterility stridulating structure supposed tail tion variability variations varieties various vary whilst whole widely wings young