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Performing Evolution: Role-Play Simulations

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Abstract

By simulating evolution through performance, students become physically, as well as mentally, engaged in thinking about evolutionary concepts. This instructional strategy redirects tension around the subject toward metacognitive reflection. Non-verbal performances like those presented here also avoid the pitfalls of relying on difficult-to-use language. This paper describes a teachable unit including the learning goals and outcomes as well as rubrics to aid assessment. Through two performance-based activities, the unit introduces the fundamental evolutionary concepts that evolution lacks forethought and that natural selection is a sorting process. By reflecting on the performances, students learn other sophisticated evolutionary concepts like hitchhiking, the effects of environmental change, and the extinction of traits. They also become aware of the scientific process, articulating hypotheses about the outcome of the simulations, collecting data, and revising their hypotheses. Discussions and homework about the performances reveal how learning progresses, and detailed rubrics help both instructors and students assess conceptual learning. This unit concludes with the opportunity for students to transfer what they have learned to new concepts: they design new performances to simulate other mechanisms of evolution, such as genetic drift, mutation, and migration.

Introduction

Even students who are curious to learn about evolution are often intimidated by it. When the subject is broached in the classroom, many students are immediately on the defensive, either as proponents of evolution or as creationists. Most introductory biology freshmen cannot define evolution even when they accept it as a scientific explanation (Jakobi 2010). Some students are afraid to learn about evolution—the misconception that evolution is entirely random can intimidate people so much that it keeps them from exploring what evolution is actually about (Mead and Scott 2010b; Miller 2002). This discomfort is exacerbated by conflating the lack of direction in evolution with a spiritual lack of purpose in life (Mead and Scott 2010a).

The single most important achievement for an instructor is to engage all students, regardless of religious background and alternative conceptions, with the fundamental logic supporting evolution (Scott 2010). Engagement helps students move beyond their apprehension, changing the timbre of the conversation from defense to learning. Dramatizing conceptual challenges—turning them into performances—helps students learn by redirecting emotion into physical movements (Harrison-Pepper 1999), so students can focus their thinking on the science.

Performance-based activity also called role-play or simulation–role-play (Aubusson and Fogwill 2006) is a form of kinesthetic learning that excels at encouraging reflection and participation (Harrison-Pepper 1999). Students who choreograph gestures with new material are better at remembering what they have learned (Cook et al. 2008). They develop metacognitive skills by analyzing the efficacy of the performance analogy (Harrison and Treagust 2006). They also learn to communicate across disciplines and become more explicitly aware of the creative nature of scientific discovery (Aubusson and Fogwill 2006; Nikitina 2003). Removing verbal language reaches across linguistic boundaries; students rely more on kinesthetic learning when taking a class in a language different from their native one (Reid 1987). The jargon that can become a barrier to engaging students in evolution in particular (Mead and Scott 2010a) is also removed, as are misleading anthropomorphic metaphors like “wanting” to change (Sinatra et al. 2008). By participating in a performance, the experience is—at least in this fleeting moment—personally relevant. Teaching that involves metacognition and personal relevance challenges intuitive conceptions in a way that is necessary to drive conceptual change towards a scientific framework for evolutionary thinking (Sinatra et al. 2008).

Nonetheless, performance-based activities have been under-utilized in higher education (Harrison-Pepper 1999; Nikitina 2003). Role-play has been used in K-12 science education to great effect, for example to dramatize how molecules ionize in different solutions (Aubusson and Fogwill 2006), but few examples exist for college biology, with notable exceptions for cell division and the central dogma (Kreiser and Hairston 2007; Weiss 1971).

This paper describes a teachable unit (Handelsman et al. 2007) with learning goals and outcomes, two performance-based activities (Evolution lacks forethought and Performing natural selection) and assessment. The activities explore heritability, variation, fitness, and natural selection to introduce fundamental concepts that form the basis of evolutionary thinking. Understanding builds from natural selection to other mechanisms of evolutionary change (Wilson 2005). I developed the unit for students in their first quarter of college at an interdisciplinary program. Although a few of the students in this class do pursue biology majors, the vast majority do not.

Concepts Addressed

This teachable unit addresses challenging concepts of evolutionary thinking in general and of natural selection in particular (Table 1; concepts and misconceptions from Gregory 2009). The primary concepts addressed are the three tenets of natural selection: heritable variation exists in populations, more offspring are born than can survive and the offspring that do survive are the ones most suited to their environment. In these activities, a thorough understanding of survival of the fittest develops by working through other concepts, including the fact that natural selection acts in the moment instead of planning ahead and the fact that the environment dictates which variants will survive. Students learn the difference between sorting and creative processes, recognizing that natural selection is a sorting process that leads to a change in the proportion of variants over time. These basics lay the foundation for learning that not all evolution is natural selection (Wilson 2005), and Performing natural selection explicitly addresses the fact that nonadaptive traits can hitchhike along with adaptive traits.

Table 1 Concepts addressed (compiled, with the exception of hitchhiking, from Gregory 2009)

Table 1 lists so many concepts that instructors who use this unit will probably want to prioritize which ones to address in their classrooms. One way to decide what to emphasize is to administer the Concept Inventory of Natural Selection (Anderson et al. 2002) at the beginning of the unit to determine where students require the most help. The unit is flexible enough to be retooled easily to address the concepts that each instructor emphasizes.

Learning Goals and Outcomes

Handelsman et al. (2007) define learning goals as the content that students will know and the skills that students will have after successfully completing an exercise; outcomes explain the way student performance indicates mastery. The learning goals of this exercise focus on the conceptual understanding of natural selection, and the outcomes expect that a strong understanding of natural selection can be applied to develop a strong understanding of other mechanisms of evolutionary change (Table 2). Each learning goal and outcome corresponds to different concepts from Table 1.

Table 2 Student learning goals and outcomes

Activities

The activities are designed to motivate students to participate fully in class, but also to work outside of the class where most learning occurs (Handelsman et al. 2007). I have developed rubrics to aid in the formative assessment of Evolution lacks forethought and Performing natural selection. These rubrics explain how each activity addresses the concepts in Table 1.

Warm-Up

Because it is unusual for science students to learn through movement, it is essential to establish early in the term the precedent that students will employ this learning style. A 15-minute ice breaker (from Boal 2002) introduces this mode of learning on the first day of class while students are fresh and enthusiastic. My classes are capped at 45 students—with a larger class, I would divide the group into two sections to do this warm-up:

  1. Step 1.

    The class arranges itself in a circle.

  2. Step 2.

    I briefly explain and demonstrate that students can move by changing their facial expression, moving their head or a limb, or by shifting their weight.

  3. Step 3.

    Each student makes a movement while stating his or her name. For example, I say “Becca” and roll my head around.

  4. Step 4.

    Everyone else simultaneously copies the movement while repeating the name. Continuing with the same example, the whole class says “Becca” and mimics my head roll.

  5. Step 5.

    Proceed around the circle, repeating steps 3 and 4, until each student has taken a turn. It is best if students make a movement that no one else has performed.

Some students may unintentionally make a movement while they are thinking about what to do: a flick of the hair, for example, or shifting weight from foot to foot. I embrace these gestures to demonstrate that simple poses are entirely adequate, that movements like these are a part of everyday communication. This encouragement builds rapport by illustrating that movement is natural and easy, not daring and foreign. Some one-on-one encouragement helps reticent students, and simple accommodations can be made for students with limited mobility. For example, if a student jumps into the circle while saying her name, a student in a wheelchair can modify the movement by moving his chair into the circle.

This warm-up activity serves two other purposes. It is an excellent way for both the instructor and the students to learn names: gestures are associated with memory (Cook et al. 2008)—think of someone gesticulating while reaching for a word—and students and I often learn each others’ names by remembering their movements. This exercise also introduces a movement vocabulary. Students become aware of the number of different poses that they can assume, a crucial step for completing the other activities.

Evolution Lacks Forethought

This performance takes about 15 minutes, although the discussion about the topics introduced can last much longer depending on how well the students understand the material and what the instructor aims to achieve. I set the stage by saying that we are experiencing a rapidly and unpredictably changing environment and that individuals are constrained by their past. The activity then proceeds as follows (Fig. 1):

  1. Step 1.

    Students line up.

  2. Step 2.

    The first student strikes a pose. This can be any random pose that he or she chooses.

  3. Step 3.

    Working independently, each student predicts what the last pose will be, jotting down a note or a sketch.

  4. Step 4.

    The second student mimics the first pose, but can change one and only one aspect of that pose.

  5. Step 5.

    The third student mimics the second pose, changing one and only one aspect of it. Continue through the line.

  6. Step 6.

    Students describe—with words or sketches—how shape changed during the simulation, comparing the result to their predictions.

  7. Step 7.

    Students work in pairs to discuss the questions in Table 3.

  8. Step 8.

    Debrief as a whole class.

Fig. 1
figure1

Evolution lacks forethought. Ten students line up. Each adopts the previous student’s pose, but changes one aspect of it. The aspect that changes is indicated at the bottom of the diagram. None of the students can deduce how the simulation will end

Table 3 Rubric for evaluating questions about Evolution lacks forethought

Forming a prediction (step 3) is crucial to the success of this activity, so students should write down their predictions and save them for later discussion. Predictions improve learning by actively engaging students in a demonstration (Crouch et al. 2004). More than that, however, is the fact that these predictions help students distinguish between evolutionary constraint and evolutionary unpredictability. By the end of the activity, students realize that they can fairly accurately predict the pose from one generation to another because only one aspect of the pose can change. In Fig. 1, for example, the second pose is almost entirely the same as the first pose; only the shape of the mouth differs. But students also realize the complementary point that they cannot predict the way several changes accrue over many generations. In Fig. 1, it is impossible to predict with certainty that the last person will be leaning slightly to the right with both arms on the right side of the body and hands pointing in different directions. The fact that the series involved two incidences of homoplasy (losing and regaining a smile, losing and regaining an upright posture) was also unpredictable. The questions in Table 3 guide students toward realizing that the unpredictability in natural selection is due to a rapidly and unpredictably changing environment that favors different poses through several generations. I push this concept even further by encouraging students to think about nonadaptive evolution. I ask them to imagine a simulation with the same outcome in which natural selection was not occurring, giving us an opportunity to discuss neutral evolution.

As with any analogy, this performance has its shortcomings in how accurately it portrays evolution. These shortcomings provide another opportunity to learn through analyzing the accuracy of the analogy (Harrison and Treagust 2006). Performing natural selection actively engages students in the idea that proportions of a trait change in the population, but Evolution lacks forethought assumes that each individual represents an entire generation. Similarly, Performing natural selection represents heritable variation with more sophistication and more clearly illustrates selection as a sorting process rather than a mechanism by which an agent chooses a trait. The role of mutation in Evolution lacks forethought is unclear. One interpretation is that each new pose is a mutation that evolved de novo. I prefer a more abstract macroevolutionary interpretation, that the variation for all the poses is maintained in the genome, but not expressed because the genes are turned off. The mutations that occur in each generation are mutations in the regulatory control mechanisms, activating some aspects of a pose and deactivating others.

To encourage students to continuing grappling with the topics raised in this activity, I recommend that instructors ask students to write out answers to the questions in Table 3 for homework. Instructors can grade the answers according to the rubric (Table 3) or ask students to grade each others’ papers in class the next meeting.

Performing Natural Selection

This performance takes approximately half an hour, and discussion continues after that. For simplicity, the description below assumes a class of 24 students, although I typically use it in a class size of 45 and I have used it in classes as large as 85. In this simulation, each round represents a generation.

  1. Step 1.

    Two students act as predators, and at least two more act as recorders. The predators and recorders count the number of prey with the trait under selection, and a ratio of four predators and recorders to 20 prey means that each predator or recorder only has five people to assess when counting the number of individuals with the trait under selection, so the performance can proceed quickly.

  2. Step 2.

    The rest of the students are prey, and they distribute themselves throughout the room and strike a unique pose (Fig. 2).

  3. Step 3.

    The predators and recorders define a maladaptive trait, some aspect of a pose that makes prey attractive to predators, for example “hands above the waist.” The predators and recorders keep the criterion a secret. The prey’s ignorance ensures that the performance represents a sorting process, and therefore, the exercise must begin again if the prey knows the predators’ criterion.

  4. Step 4.

    The predators and the recorders count the number of prey that express the maladaptive trait, and the recorders tabulate the data for the whole class to see. The individuals acting as prey map the class (for a large class, they can map the subsample of students closest to them), noting the poses for each prey individual. The maps approximate the cells in Fig. 2.

  5. Step 5.

    The predators, moving from opposite sides of the room, have ten seconds to hunt, an interval that is short enough that some of the individuals with the maladaptive trait will remain in the population. Predators hunt by walking toward prey and touching them on the shoulder. Every time a predator touches a prey, that prey dies.

  6. Step 6.

    Reproduction occurs when survivors clone their ancestors’ poses; in practice, this means that the survivors can move to a different spot in the room, but they need to keep the same pose. The students who represented dead prey re-enter the population as babies, copying the pose of any survivor. The predators and recorders now re-count the number of individuals in the population with the maladaptive trait.

  7. Step 7.

    The students representing the prey record their hypothesis about which trait they think is under selection.

  8. Step 8.

    Round 2 occurs, repeating Steps 4, 5, 6, and 7.

  9. Step 9.

    Round 3 follows exactly like Round 2, etc. Three rounds are usually sufficient to demonstrate selection, and the maladaptive trait may even have gone extinct as in Fig. 2. Conclude with the tabulations in step 4.

  10. Step 10.

    Students work in pairs to discuss the questions in Table 4.

  11. Step 11.

    Debrief as a whole class.

Fig. 2
figure2

Performing natural selection. The first round begins with 24 unique poses. The first row distinguishes between individuals with and without the trait “hands above the waist.” The prey that are captured are highlighted in the second row. Reproduction occurs between the second and third rows. Survivors are cloned, some more than once so that population size returns to 24. The poses that replace those that went extinct are emphasized with a gray cloud to indicate that the frequency of “hands above the waist” has changed. Some of these replacement poses have the maladaptive trait at the end of rounds 1 and 2 because the maladaptive trait is still present among survivors. By the end of round 3, however, no survivor has the trait. The frequency of the maladaptive trait moves from 0.58 at the beginning of round 1 to 0.0 at the end of round 3, and the number of poses drops from 24 at the beginning of the simulation to ten at the end

Table 4 Rubric for evaluating questions about Performing natural selection

The steps in the performance mimic the tenets of natural selection (Fig. 2). When the prey individuals are waiting to be hunted (step 4), it is obvious that more of them are alive than will survive. The individuals that are hunted have a maladaptive trait, indicating that they are less fit to survive (step 5). Heritable variation is illustrated by step 6. The survivors clone themselves, and so of course the survivors represent existing variation. The way heritable variation is emphasized occurs when the actors that had represented dead individuals re-enter the population as babies, bringing the population back to its original size. These new individuals must copy the pose of any survivors. They cannot invent new variation. This subtlety is critical for illustrating to students that natural selection will, over the long term, lead to the extinction of maladaptive traits.

The performance introduces the concept of hitchhiking. The students who act as prey continually hypothesize about which trait is under selection; some of their hypotheses may appear to be correct, even when they are not, because all of the individuals who were selected may share additional traits other than the one that was under selection. In Fig. 2, for example, the “hands above the waist” is selected against, but all of the survivors have “both feet on the ground” in addition to having “a hand at or below the waist.”

After the performance, students work in pairs to answer the questions in Table 4. These questions ask students to draw diagrams that show how evolution proceeds under different conditions. For visual learners, these maps are an effective tool for contemplating and describing each step (Felder and Brent 2005). Because I want my students to supplement their visual understanding with the ability to describe evolution verbally, I also ask students to answer the questions orally, for example by presenting their diagrams to the whole class for discussion, or in writing answers to the questions as homework.

By answering the questions, students apply the tenets of natural selection and explore the interaction between selection and the environment. They study the data generated by the performance, documenting hitchhiking of some traits and the extinction of others by looking at how the proportions of different traits change in the population through time. By the end of the discussion, they can distinguish between sorting, creative, and random processes in evolution.

As with Evolution lacks forethought, students greatly benefit from discussing the limits of this analogy of natural selection. This discussion can occur at the end of this teachable unit, or the instructor may choose to return to this analogy after students work with natural selection in other contexts. Students will likely observe that this simulation does not address how variation is introduced into the population: mutation and recombination are not addressed. Macroevolutionary concepts like heterochrony and speciation are also absent. For some students, though, this exercise triggers new questions about macroevolution, and they begin anticipating future teachable units, asking how changes accrue over time. The simulation also de-emphasizes the role of differential reproduction because everyone reproduces at the same rate and at the same time.

Assessment

The discussion, drawings, and written exercises that immediately follow the performances provide opportunities for formative assessment (assessment during the teachable unit; Handelsman et al. 2007), and the summative assessments (assessment at the end of the unit; Handelsman et al. 2007) that I describe in this section ask students to translate what they have learned into new contexts. This process of translation helps change prior conceptions, allowing students to construct a new and more accurate conceptual framework (Bransford et al. 2000) and leading to the outcomes specified in Table 2.

Scientific Inquiry

Learning is enhanced when students are aware of the steps they have taken to construct their knowledge (Bransford et al. 2000). To encourage metacognitive reflection, I ask students to juxtapose their performances onto a flow chart depicting the scientific method (Understanding Science 2010). They include the notes they took, the hypotheses that they formed and revised, and the discussions they had, articulating how each piece contributed to their learning. Students can choose the best way to represent this reflection: verbal learners, for example, might use outlines, and visual learners could present a concept map.

Case Studies

A number of brief descriptions of natural selection are readily available on the Internet through the Understanding Evolution (2010) and the National Evolutionary Synthesis Center (NESCent 2010) websites. Students work through the case studies by answering slightly modified versions of the questions in Table 4:

  • ▪ How does this case study illustrate heritable variation in a population?

  • ▪ How do you know more offspring are born than can survive?

  • ▪ Illustrate how natural selection affects this population, indicating how and why individuals are sorted. Describe how the frequency of different traits changes from generation to generation.

  • ▪ What kinds of environmental change would alter the selective pressures?

Another kind of case study asks students to correct misconceptions. Some diagrams, for example, depict common intuitive yet incorrect interpretations of natural selection (e.g., Fig. 2 in Gregory 2009). The instructor can distribute copies of confusing or inaccurate figures and have students generate new figures that are clear and accurate.

Designing a New Simulation

A powerful way to assess how well students understand these concepts is to ask them to choreograph their own performances (Aubusson and Fogwill 2006; Nikitina 2003) to model other mechanisms that change the frequency of traits in a population. By designing their own performances, students identify where they are confused and work collaboratively to improve their understanding (Aubusson and Fogwill 2006). After introducing mutation, genetic drift, and migration, students work in small groups to choreograph how each of these mechanisms can lead to heritable change. The students map their simulations (as in Fig. 2) and generate a series of questions that analyze the performance. Then, students perform each others’ simulations. Finally, students compare their simulations to real-life examples of evolution occurring by the mechanism they invoked. This act of choreography summarizes the fundamental concepts about natural selection that were introduced in the previous activities (Table 1), reviews the learning goals and outcomes (Table 2), and applies their newly constructed knowledge to solve a new problem. Table 5 presents a rubric for evaluating the new performances and explicates how the performance aligns with the concepts, learning goals, and outcomes.

Table 5 Rubric for a performance simulation that students design

Conclusion

By the time students reach college, their understanding of evolution is limited and full of misconceptions (Jakobi 2010). Learning evolutionary fundamentals through performance-based activities offers a new context for introducing evolution that breaks traditional barriers. Moving through the classroom excites interest. Students experience a sorting process by participating in one, an approach that I find to be particular efficient at introducing fundamental concepts.

The hook offered by performance is an introduction—a game—that needs to be supplemented with thoughtful discussion. Students learn from the performances by treating them like mini-experiments, formulating hypotheses, collecting data and, especially, analyzing their results (Harrison and Treagust 2006). Thus, the questions at the end of the performances are absolutely critical for gaining the sophisticated understanding described in the rubrics (Tables 35) and for thinking critically about the analogies that the performances represent (Harrison and Treagust 2006).

Anecdotally, these performances have been extremely successful. Students have fun during the simulations, and they immediately begin grappling with the concepts that I am trying to teach, nodding and talking as they learn. When I see students again in other classes, they remember the poses they adopted and use those memories to think about different evolutionary processes. I have planned formal evaluation of these activities to (1) document what students learn, (2) quantify the degree of conceptual change, (3) compare student enthusiasm for this approach with others, (4) assess long-term retention of the knowledge acquired, and (5) determine how student understanding before and after the performances varies among biology students, students in other areas of science, and non-science students.

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Acknowledgments

I thank Kory Perigo and the students of Discovery Core I in 2007–2009 for participating in these exercises, Kanta Kochhar-Lindgren for introducing me to performance-based learning, and to David Goldstein, Karen Gourd, and Marc Servetnick for their editorial suggestions.

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Correspondence to Rebecca M. Price.

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Price, R.M. Performing Evolution: Role-Play Simulations. Evo Edu Outreach 4, 83–94 (2011) doi:10.1007/s12052-010-0300-7

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Keywords

  • Interdisciplinarity
  • Performing arts
  • Kinesthetic learning
  • Role-play
  • Natural selection
  • Simulation
  • Scientific teaching