By Hans A. Went

Incorporated one of several arrangements for telephone dtivision in mos, t greater vegetation and animals is the constel1ation . of eV'eruts encompassing the for mation . of the, spindle or mitotic app'al'latus, based upon th, e org1anism. those are brief buildings, resP. onsibl

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Additional info for The Behavior of Centrioles and the Structure and Formation of the Achromatic Figure: Kern- und Zellteilung G der Kernteilungsmechanismus 1

Sample text

As in the other genera, each new centriole begins the production of extranuclear organelles shortly after it has been generated by the proximal end of an old centriole, which means that there are enough new extranuclear organelles to give each daughter cell the same number as the parent cell had before oell reproduction began. The Type 4 life cycle has been observed only in the genus Macrospironympha. In the resting cell both centrioles are elongate and in this sense they resemble the pattern observed in Barbulanympha.

There is only a partial answer to this question and some of the supporting data has been presented. The diagram in Figure 7 assembles into a single scheme the possible interrelationships that may exist among these various bodies. It should be recognized that this represents a composite of individual steps gleaned from experimental observations on various organisms and is therefore subject to limitations inherent in a hypothetical scheme of this genesis. The step from kinetochore to centriole is based upon indirect evidence and must be accepted until clearly c-ontrary Idata become available.

The splittin:g of each mitotic center present at the onset of the ME block, and its separation to form a tetrapolar division ~re, can be observed in samples of cells removed at intervals during the course of the block. All during the transformation the chromosomes remained condensed and in the metaphase configuration. greatly affected by the ME. The control embryos at the second cleavllJge division each have four centers, while the cells blocked by ME at first cleavage metaphllJse and allowed to remain in the ME sea water until the control embryos were dividing into four cells also had four centers.

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