. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. C. MEIOSIS A N NORMAL. c Fig. —Comparison of a c-meiosis and c-mitosis. The stage reached when colchicine becomes effective determines the action in meiosis. (After Levan) tissue gives rise to tetra})loid j^ollen mother cells, and that two c- mitoses bring about the octoploid condition. Beyond this degree of ]«)lyjjloidy the meiotic processes are so upset that no finther action of colchicine can be obtained at meiosis. The premeiotic stages of Allium ccniiiinn with diploid, tetraploid, and octoploid numbe
. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. C. MEIOSIS A N NORMAL. c Fig. —Comparison of a c-meiosis and c-mitosis. The stage reached when colchicine becomes effective determines the action in meiosis. (After Levan) tissue gives rise to tetra})loid j^ollen mother cells, and that two c- mitoses bring about the octoploid condition. Beyond this degree of ]«)lyjjloidy the meiotic processes are so upset that no finther action of colchicine can be obtained at meiosis. The premeiotic stages of Allium ccniiiinn with diploid, tetraploid, and octoploid numbers 7, 14, and 28 pairs, respectively, were observed and followed up to the first meiosis.'^'' Already at tetraploid stages, the polarities of meiotic spindles were irregular. The multii>le spindle aspects dining re- covery from a c-mitosis were noticed at meiosis if the previous c-mitotic cycles of archesporial cells caused polyploidy. Pairing of homologous chromosomes and chiasmatal formation formed during prophase are decisive functions before a regidar meiosis. 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 Eigsti, O. J. (Orie Jacob), 1908-; Dustin, Pierre. Ames, Iowa State College Press
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