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. 2017 Mar 15;28(6):825–833. doi: 10.1091/mbc.E16-09-0678

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© 2017 Shodhan et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).

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FIGURE 1: — Schematic of meiotic progression in Tetrahymena. Meiosis takes place simultaneously in two conjugating cells. Generative micronuclei (MIC) undergo meiosis, whereas vegetative polyploid macronuclei (MAC) do not play a role in sexual reproduction. During prophase, MICs transiently elongate to about twice the length of the cell. At metaphase I, bivalents condense and assemble into a metaphase plate. Chromosomes segregate at anaphase I, and chromatids segregate at anaphase II. The classification of prophase stages is modified from Sugai and Hiwatashi (1974): stage I, egg-shaped nucleus; stage II-III, elongating nucleus shorter than the cell; stage IV, nucleus approximately twice the length of the cell; early stage V, shortening nucleus approximately the length of the cell and slightly bent; late stage V, nucleus shorter than the cell, straight, with inhomogeneously distributed chromatin.