PROTOPLASM AND CELL 



51 



formation of chromosomes. During these changes the nuclear mem- 

 brane begins to degenerate. In the late prophase stage the centrioles 

 have reached the polar positions on opposite sides of the nucleus. The 

 spindle extends between the two asters, and the chromosomes become 



CEI_1_ 



MEfs/IBRANE 

 —CENTROSPHERE 

 -MUCL.EAR 



MEMBRANE 



CHROMATIN 

 NUCt_EOl_US 

 CVTOPL.ASM 



— CENTRlOUe 





RE ME 



RESTING CELU 



SPINDt_E 

 ASTRAU 



RAys 



— CHROMOSOME 



EARLY P ROPHASE 



-EQUATORJ AU 



LATE PROPHASE 



METAPHASe 



77 ADJACENT 

 CELL. 



INTERZONAL, 



FI esRs 



EARLY ANAPHASE 



l-ATE ANAPHASE 



CL.EAVAGE 

 FURROW 



TELOPHASE 



DAUGHTER CEl_LS 



arranged on the spindle fibers, end to end in a row at the equatorial 

 position. This plate of chromosomes constitutes what is called the 

 equatorial plate. The nuclear membrane has almost completely de- 



