The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
도서 본문에서
84개의 결과 중 1 - 3개
283 페이지
... parent - species . The hybrids from the common and Chinese geese ( A. cygnoides ) , species which are so different that they are generally ranked in distinct genera , have often bred in this country with either pure parent , and in one ...
... parent - species . The hybrids from the common and Chinese geese ( A. cygnoides ) , species which are so different that they are generally ranked in distinct genera , have often bred in this country with either pure parent , and in one ...
307 페이지
... parent forms , and he experimented on uncultivated species of willows , while Naudin , on the other hand , insists ... parent form by repeated crosses in successive generations with either parent . Both These several remarks are ...
... parent forms , and he experimented on uncultivated species of willows , while Naudin , on the other hand , insists ... parent form by repeated crosses in successive generations with either parent . Both These several remarks are ...
461 페이지
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ...
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally 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