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
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary 129 CHAPTER VI DIFFICULTIES ON THEORY Difficulties on ...
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary 129 CHAPTER VI DIFFICULTIES ON THEORY Difficulties on ...
11 페이지
... characters Affinities , general , complex and radiating Extinction separates and defines groups - MORPHOLOGY , between members of the same class , between parts of the same individual— EMBRYOLOGY , laws of , explained by variations not ...
... characters Affinities , general , complex and radiating Extinction separates and defines groups - MORPHOLOGY , between members of the same class , between parts of the same individual— EMBRYOLOGY , laws of , explained by variations not ...
24 페이지
... character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are quite ... characters to its grandfather or grandmother or other more remote ancestor ; why a peculiarity is often transmitted ...
... character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are quite ... characters to its grandfather or grandmother or other more remote ancestor ; why a peculiarity is often transmitted ...
25 페이지
... characters to ancestral forms , it seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many generations , the several races , for instance , of the cabbage , in very poor soil ( in which ...
... characters to ancestral forms , it seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many generations , the several races , for instance , of the cabbage , in very poor soil ( in which ...
26 페이지
... character probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic ...
... character probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic ...
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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