This activity has benefited from input from faculty educators beyond the author through a review and suggestion process.
This review took place as a part of a faculty professional development workshop where groups of faculty reviewed each others' activities and offered feedback and ideas for improvements. To learn more about the process On the Cutting Edge uses for activity review, see http://serc.carleton.edu/NAGTWorkshops/review.html.
This page first made public: Jun 4, 2009
Skills and concepts that students must have mastered
How the activity is situated in the course
I use the morphologies generated in a later exercise on cladistics and phenetics.
Content/concepts goals for this activity
Ilustrate isometric and anisometric growth.
Higher order thinking skills goals for this activity
Importance of differential growth in generating diversity.
Other skills goals for this activity
Description of the activity/assignment
Later in the semester, the 'adult' trilobites are used to generate a data matrix of morphologic features of related species. Students work in groups so that there are a few different data matrices for the same set of species. A cladistic analysis and a cluster analysis (phenetics) produce possible phylogenies for the data matrices. We compare the results in a class discussion.
Determining whether students have met the goals
Download teaching materials and tips
- Activity Description/Assignment:Student Instructions for Ontogeny Exercise (Microsoft Word 22kB Jun1 09)
- Instructors Notes:Instructor Notes (Microsoft Word 21kB Jun1 09)
- Solution Set: