The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538ÆäÀÌÁö |
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... degree in the first cross and in the hybrids produced from this cross ; that the fertility of hybrids is not related to the degree in which they resemble in external appearance either parent ; and lastly , that the facility of making a ...
... degree in the first cross and in the hybrids produced from this cross ; that the fertility of hybrids is not related to the degree in which they resemble in external appearance either parent ; and lastly , that the facility of making a ...
292 ÆäÀÌÁö
... degree of sterility could be increased through natural selec- tion to that high degree which is common with so many species , and which is universal with species which have been differentiated to a generic or family rank , will find the ...
... degree of sterility could be increased through natural selec- tion to that high degree which is common with so many species , and which is universal with species which have been differentiated to a generic or family rank , will find the ...
436 ÆäÀÌÁö
... degree . They may metaphorically be called cousins to the same millionth degree , yet they differ widely and in dif- ferent degrees from each other . The forms descended from A , now broken up into two or three families , consti- tute a ...
... degree . They may metaphorically be called cousins to the same millionth degree , yet they differ widely and in dif- ferent degrees from each other . The forms descended from A , now broken up into two or three families , consti- tute a ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young