Footnotes to Evolution: A Series of Popular Addresses on the Evolution of LifeD. Appleton, 1898 - 392 pagini |
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Pagina xvii
... Boveri ) 7. Development of Pandorina ( after Pringsheim ) 8. Colony of Eudorina with antherozooids ( after Goebel ) 9. Diagram of development of spermatozoa ( after Boveri ) . 10. Fertilization of egg ( after Boveri ) II . Reduction of ...
... Boveri ) 7. Development of Pandorina ( after Pringsheim ) 8. Colony of Eudorina with antherozooids ( after Goebel ) 9. Diagram of development of spermatozoa ( after Boveri ) . 10. Fertilization of egg ( after Boveri ) II . Reduction of ...
Pagina 151
... Boveri , in 1888 , gave the name of " centrosome , " and showed it to be a cell organ of probably constant occurrence and of the greatest significance in cell multiplication . It often lies in a more or less specialized area of the ...
... Boveri , in 1888 , gave the name of " centrosome , " and showed it to be a cell organ of probably constant occurrence and of the greatest significance in cell multiplication . It often lies in a more or less specialized area of the ...
Pagina 159
... Boveri back to the first division of the egg . This case of Ascaris megalocephala is so striking and of such fundamental theoretical importance that it must not be passed without notice , for in it we find marked differences between the ...
... Boveri back to the first division of the egg . This case of Ascaris megalocephala is so striking and of such fundamental theoretical importance that it must not be passed without notice , for in it we find marked differences between the ...
Pagina 160
... of the lower A C 010 B D FIG . 6. - Reduction of the chromatin in the cleavage of the egg of Ascaris megalocephala var . univalens . ( After Boveri . ) This cells are the remnants of the ends of the. 160 FOOT - NOTES TO EVOLUTION ..
... of the lower A C 010 B D FIG . 6. - Reduction of the chromatin in the cleavage of the egg of Ascaris megalocephala var . univalens . ( After Boveri . ) This cells are the remnants of the ends of the. 160 FOOT - NOTES TO EVOLUTION ..
Pagina 171
... Boveri , illustrate clearly the homologies existing between the life histories of the two sorts of germ cells . The earlier stages of ovogonia and spermatogonia are indistinguish- able from each other ; later in the period of growth the ...
... Boveri , illustrate clearly the homologies existing between the life histories of the two sorts of germ cells . The earlier stages of ovogonia and spermatogonia are indistinguish- able from each other ; later in the period of growth the ...
Alte ediții - Afișează-le pe toate
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1898 |
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1919 |
Footnotes to Evolution: A Series of Popular Addresses on the Evolution of Life David Starr Jordan Vizualizare completă - 1919 |
Termeni și expresii frecvente
acquired characters adaptation altruism ancestors ancestry animal or plant become biological birds blood body Boveri centrosome chromatin chromosomes colony colour competition concession conjugation creatures cytoplasm Darwin descendants division earth Echinus egg cell elements embryo embryology environment evidence extrinsic fact factors fauna fish fittest food yolk forces forms function Galapagos germ cell germinal protoplasm growth Herbert Spencer hereditary heredity homology human increase individual influence inheritance intrinsic causes islands known larva larvæ less Linnæus living mammals ment modified mother natural selection naturalists never nucleus organic evolution Origin of Species parent peculiarities phenomena pineal eye plasm produced progress protoplasm protozoa question rabbit race recognised relations reproduction result Richard Roe Sacculina says shown simple somatic special creation sperm spermatozoa Sphærechinus stages structure struggle for existence survival tetrads tion true variation variety vertebræ vertebrates Weismann words