Microtubule arrays during the first cell cycle in the purple urchin Strongylocentrotus droebachiensis.

The purple urchin zygote has a diameter of approximately 80 µm. In this zygote furrowing normally initiates just after microtubule tips reach the cell equator. For a detailed description of the relationship between microtubules and myosin regulation during cytokinesis see Foe and von Dassow, 2008. Also note here and in the companion gallery showing microtubules in green urchin zygotes how, prior to anaphase onset and beginning again in telophase, microtubules in each half-cell emanate from a point - the centrosome. By contrast, during anaphase astral microtubules project back to the edge of an enlarging circle - the periphery of the centrosphere.

Please note: images on this page belong to Victoria Foe. You are welcome to use them in your own presentations/lectures with appropriate credit.

The thumbnail images (150X150 pixels) below link to high-resolution images that will open in a new window – (1024X1024 pixels; approx. 275KB).

1interphase

1 interphase

2

2 prophase

3metaphase

3 metaphase

4anaaphase

4 anaphase

5anaphase

5 anaphase

6anaphase

6 anaphase

 
7telophase

7 telophase

8telophase

8 telophase

9telophase

9 telophase

10telophase.jpg

10 telophase

11telophase

11 telophase

12interphase

12 interphase

 
 
 

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