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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8 페이지
... parent - Explains the Grouping of all organic beings- Advance in organisation - Low forms preserved - Objections considered - Indefinite multiplication of species - Summary .. 78 CHAPTER V LAWS OF VARIATION Effects of external ...
... parent - Explains the Grouping of all organic beings- Advance in organisation - Low forms preserved - Objections considered - Indefinite multiplication of species - Summary .. 78 CHAPTER V LAWS OF VARIATION Effects of external ...
21 페이지
... parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that there is no essential difference between a bud and an ovule in their earliest stages of formation ; so that , in fact ...
... parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that there is no essential difference between a bud and an ovule in their earliest stages of formation ; so that , in fact ...
22 페이지
... parent . The great and inherited development of the udders in cows and goats in countries where they are habitually milked , in comparison with the state of these organs in other countries , is another instance of the effect of use ...
... parent . The great and inherited development of the udders in cows and goats in countries where they are habitually milked , in comparison with the state of these organs in other countries , is another instance of the effect of use ...
23 페이지
... parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable ... parent - VARIATION UNDER DOMESTICATION 23.
... parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable ... parent - VARIATION UNDER DOMESTICATION 23.
24 페이지
... parent - say , once amongst several million individuals— and it reappears in the child , the mere doctrine of chances almost compels us to attribute its reappearance to inheritance . Everyone must have heard of cases of albinism ...
... parent - say , once amongst several million individuals— and it reappears in the child , the mere doctrine of chances almost compels us to attribute its reappearance to inheritance . Everyone must have heard of cases of albinism ...
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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