The cell in development and inheritance . Fig. 38. — Mitotic division in Infusoria. [R. Hertwig.] A-C. Macronucleus of Spirochona, sliowing pole-plates. D-H. Successive stages in thedivision of the micronucleus of/ta^-flWAT/ww. D. The earliest stage, showing reticulum. G. Fol-lowing stage ( sickle-form ) with nucleolus. E. Chromosomes and pole-plates. F. Late ana-phase. H. Final phase. the nuclear membrane may persist more or less completely throughevery stage {Noctihica, EiiglypJia, ActinospJicEriiini). 2. Asters maybe present (Hehozoa, gregarines) or wanting (In-fusoria, Radiolaria). 3. In o
The cell in development and inheritance . Fig. 38. — Mitotic division in Infusoria. [R. Hertwig.] A-C. Macronucleus of Spirochona, sliowing pole-plates. D-H. Successive stages in thedivision of the micronucleus of/ta^-flWAT/ww. D. The earliest stage, showing reticulum. G. Fol-lowing stage ( sickle-form ) with nucleolus. E. Chromosomes and pole-plates. F. Late ana-phase. H. Final phase. the nuclear membrane may persist more or less completely throughevery stage {Noctihica, EiiglypJia, ActinospJicEriiini). 2. Asters maybe present (Hehozoa, gregarines) or wanting (In-fusoria, Radiolaria). 3. In one series of forms the centrosome or sphere is representedby a persistent intranuclear body (nucleolo-ccntrosome) of consider-able size, which divides to form a kind of central spindle {Eiig/iuaAmoeba, ). 4. In a second series the centrosome or sphere is a persistent 90 CELL-DIVISION extranuclear body, as in most Metazoa {Heliosoa, Noctilitca, Para-moebd). 5. In a few forms having a scattered nucleus the chromatin-gran-ules
Size: 2807px × 890px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
