Evolution and animal life, an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animalsD. Appleton, 1908 - 489 páginas |
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Página 69
... specific characters , largely traits neither useful nor harmful , will be derived for the most part the specific characters of their successors . It is not essential to the meadow lark that he should have a black blotch on the breast or ...
... specific characters , largely traits neither useful nor harmful , will be derived for the most part the specific characters of their successors . It is not essential to the meadow lark that he should have a black blotch on the breast or ...
Página 81
... specific desirable qualities or to elimi- nate those undesirable , this accompanied by conscious selection directed toward definite ends . On this series of processes breeding as a fine art must depend . Taking as an illustration some ...
... specific desirable qualities or to elimi- nate those undesirable , this accompanied by conscious selection directed toward definite ends . On this series of processes breeding as a fine art must depend . Taking as an illustration some ...
Página 109
... specific statement of different forms or phases of this kind of isolation . In " Darwin and After Darwin , " III , p . 7 et seq . , he writes : " Now the forms of discriminate isolation , or homogamy , are very numerous . When , for ...
... specific statement of different forms or phases of this kind of isolation . In " Darwin and After Darwin , " III , p . 7 et seq . , he writes : " Now the forms of discriminate isolation , or homogamy , are very numerous . When , for ...
Página 110
... specific types , I have reserved the name Physiological Selection . " If the factors of variation , heredity , natural selection , and isolation are , in the minds of most naturalists , the chief factors in species - forming and descent ...
... specific types , I have reserved the name Physiological Selection . " If the factors of variation , heredity , natural selection , and isolation are , in the minds of most naturalists , the chief factors in species - forming and descent ...
Página 112
... possibility of specific adapta- tion and the possibility of progressive or truly evolutionary change . Not all evolution is in a single direct line , to be sure ; ascent is not up a single ladder or 112 EVOLUTION AND ANIMAL LIFE.
... possibility of specific adapta- tion and the possibility of progressive or truly evolutionary change . Not all evolution is in a single direct line , to be sure ; ascent is not up a single ladder or 112 EVOLUTION AND ANIMAL LIFE.
Outras edições - Ver tudo
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and animal life, an elementary discussion of facts, processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Palavras e frases frequentes
actual adaptation adult animals animals and plants ants apes appear artificial selection bees beetles biologists birds body breeding butterfly called causes centrosome changes CHAPTER characters chromatin chromosomes color and pattern common crab Darwin degeneration degree descent differentiation division egg cell embryo environment existence fact factors fauna female fertilized fishes forms fossils genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals known larva larvæ live lower male mammals matter ment modified mutations natural selection naturalists nest nucleus offspring organic evolution origin Origin of Species parasites parent phenomena plasm primitive produced protoplasm Protozoa race relation reproduction reptiles resemblance Sacculina sea anemone sexual sexual selection sheep species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers young