PLATE 29. Changes in a Cell During Mitosis. (Modified from Stras- 

 burger, Noll, Schenck, Karsten, " Text Book of Botany ".) 



No, Nucleolus. AT, Nucleus. P, Polar caps. C, Chromosomes. PB, Polar 

 bodies. S, Spindle fibers. Z, Cell plate. A, Separation of chromosome loops by 

 traction fibers of the spindle, a and 6 are halves of a chromosome loop. 



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