In-class Exercise: Sources of Variation in Populations
Jack D. Farmer
,
Arizona State University
This activity was selected for the On the Cutting Edge Reviewed Teaching Collection
This activity has received positive reviews in a peer review process involving five review categories. The five categories included in the process are
- Scientific Accuracy
- Alignment of Learning Goals, Activities, and Assessments
- Pedagogic Effectiveness
- Robustness (usability and dependability of all components)
- Completeness of the ActivitySheet web page
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This activity has benefited from input from faculty educators beyond the author through a review and suggestion process.
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Initial Publication Date: June 16, 2009 | Reviewed: June 24, 2014
- First Publication: June 16, 2009
- Reviewed: June 24, 2014 -- Reviewed by the On the Cutting Edge Activity Review Process
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Cite thisSummary
Students identify sources of morphological variation (genetic, ontogenetic, sexual, and ecophenotypic differences) among the individuals of populations for three different species, one of which is colonial.
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Audience
GLG 460 Introduction to Paleontology is a required course for students majoring in the geological sciences and an elective course for biology students. Graduate credit is offered upon enrolling in GLG 590 Paleontology. (Requires additional research project assignments for graduate credit).
Skills and concepts that students must have mastered
Basic biology or historical geology
How the activity is situated in the course
This project is offered the second week of the course and provides a basic foundation for students to know how to look at fossils to extract the morphological information they contain. Understanding sources of morphological variation in populations is considered foundational for all subsequent topics in the course.
Goals
Content/concepts goals for this activity
Understand the sources of morphological (and by extension, behavioral) variation among the individuals of a population and the role that such variation plays in adaptation and evolution.
Higher order thinking skills goals for this activity
Observation and critical evaluation to select between competing explanations.
Other skills goals for this activity
Creating concept sketches, detailed visual observation and comparison. Presenting ideas orally within a group.
Description of the activity/assignment
To prepare for this in-class exercise, students read relevant background material in their textbook and then hear a lecture about sources of variation in populations. Students then form small groups (5 individuals per group) and spend time examining specimens sampled from natural populations of three species. They make sketches and discuss the different types of morphological variation seen, then assign different components of the observed varation to the following sources: Genetic, ontogentic, sexual and ecophenotypic.
Determining whether students have met the goals
Groups report out to the larger group, then turn in their written responses, which are in turn evaluated by the instructor.
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