. Cytology. Cytology. (b) Figure 6-8. Electron Micrographs Showing Formation of Chromosomal Fiber During Meiosis in Pollen Mother Cells of Lily: (a) beginning of development of chromosomal fiber in first meiotic division of Lilium lanci- folium. Note granules drawn up in several lines from the kinetochore region of the chromosome and extending toward the pole to form a bundle of fibers. Within this bundle short fibrils are formed; 6500X. (b) Part of com- plete chromosomal fiber in metaphase I of pollen mother cell of Lilium speciosum. The chromosomal fiber is made up of a bundle of fibrils, ab
. Cytology. Cytology. (b) Figure 6-8. Electron Micrographs Showing Formation of Chromosomal Fiber During Meiosis in Pollen Mother Cells of Lily: (a) beginning of development of chromosomal fiber in first meiotic division of Lilium lanci- folium. Note granules drawn up in several lines from the kinetochore region of the chromosome and extending toward the pole to form a bundle of fibers. Within this bundle short fibrils are formed; 6500X. (b) Part of com- plete chromosomal fiber in metaphase I of pollen mother cell of Lilium speciosum. The chromosomal fiber is made up of a bundle of fibrils, about 15 in number; 6500X. (From Sato, S., 1960. "Electron Microscope Studies on the Mitotic Figure. III. Process of the Spindle Formation," Cytologia, 25, Figs. 6 and 7, p. 126. Courtesy of Dr. S. Sato. University of Tokyo.) the spindle are developed from the kinetochore of each chromosome and grow toward the pole of the cell (Figure 6-8 (a) and (b)). The fact that akinetic chromosome fraigments at metaphase do not undergo ana- phase movement supports the view that there is an actual attachment of the chromosomes to the spindle apparatus. Also, the abortive attempts MECHANICS AND PHYSIOLOGY OF CELL DIVISION / 151. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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