This activity is based on an activity developed by Kristie Geiger Stevens, Catalina Foothills High School, Tucson, Arizona, and Denice Warren and Deborah Alongi, as part of the Image Processing for Teaching (IPT) project, University of Arizona, Tucson, Arizona.
Chromosome images courtesy of the Center for Image Processing in Education, which distributes materials created by the University of Arizona's IPT project.
UA's Biology 181 laboratory class field-tested this activity with 1,500 undergraduate students who came to the Biology Learning Center. Thank you to the Biology Learning Center staff, 181 students and graduate teaching assistants for providing valuable feedback.