The Biology Project - Cell Biology The Biology Project Cell Biology

Credits for Online Onion Root Tips

Content author

Denice Warren
Senior Instructional Specialist
The Biology Project

HTML author

Denice Warren

Graphic artists

Illustrations of mitosis
Marcia Underwood

Cell images
Denice Warren


This activity uses images from the activity "The Cell Cycle: How much time is spent in each phase?" developed by Deborah Alongi and Denice Warren, as part of the Image Processing for Teaching (IPT) project, The University of Arizona
, Tucson, Arizona.

Cell images courtesy of the Center for Image Processing in Education, which distributes these University-developed materials. "The Cell Cycle" activity is published as part of the HIP Biology CD-ROM.


Warren, D. K. (1996). Online Onion Root Tips. The Biology Project [Online], Available:

The Biology Project
University of Arizona
January 9, 2003
Revised: August 2004
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