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Microbiology, 2021

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3.4 • Unique Characteristics of Eukaryotic Cells 109<br />

Figure 3.40<br />

Karyokinesis (or mitosis) is divided into five stages—prophase, prometaphase, metaphase, anaphase, and telophase. The<br />

pictures at the bottom were taken by fluorescence microscopy (hence, the black background) of cells artificially stained by fluorescent<br />

dyes: blue fluorescence indicates DNA (chromosomes) and green fluorescence indicates microtubules (spindle apparatus). (credit “mitosis<br />

drawings”: modification of work by Mariana Ruiz Villareal; credit “micrographs”: modification of work by Roy van Heesbeen; credit<br />

“cytokinesis micrograph”: Wadsworth Center/New York State Department of Health; scale-bar data from Matt Russell)<br />

In addition to the mitotic asexual reproduction described above, most eukaryotic microorganisms also have<br />

the option of sexual reproduction involving meiosis. Although mitosis and meiosis both require DNA<br />

replication, nuclear division, and share procedural similarities, there are important differences between the<br />

process and outcomes (Figure 3.41).

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