On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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16 페이지
... sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified form . This ...
... sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified form . This ...
21 페이지
... sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , & c . , and sometimes by seed . These sports are extremely rare under nature , but far from rare under cultivation ; and ...
... sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , & c . , and sometimes by seed . These sports are extremely rare under nature , but far from rare under cultivation ; and ...
24 페이지
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or other more remote ancestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one ...
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or other more remote ancestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one ...
29 페이지
... sometimes ( as I have found with pigeons ) extremely uniform , and everything seems simple enough ; but when these mongrels are crossed one with another for several generations , hardly two of them will be alike ; and then the extreme ...
... sometimes ( as I have found with pigeons ) extremely uniform , and everything seems simple enough ; but when these mongrels are crossed one with another for several generations , hardly two of them will be alike ; and then the extreme ...
33 페이지
... sometimes concur perfectly developed . More- over , when birds belonging to two ог more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to ...
... sometimes concur perfectly developed . More- over , when birds belonging to two ог more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely