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Approaches to Biology Teaching and Learning |
*Department of Natural Sciences and Mathematics, Interdisciplinary Science, Eugene Lang College, The New School for Liberal Arts, New York, NY 10011; Department of Biological Sciences, University of Delaware, Newark, DE 19716; and San Francisco State University, San Francisco, CA 94132
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INFUSING SOCIAL CONTEXT IN BIOLOGY TEACHING |
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It is imperative that developmental biologists learn of the possible social consequences of their work and of the possible molding of their discipline by social forces. For today's biology students may be given more physical and social power than any group of people before them.– Scott Gilbert and Anne Fausto Sterling
Biology is front page news, so it is important that we teach students to make connections between what they learn in the classroom and what they see in everyday life. As biology researchers, we recognize the negative implications of doing science in a vacuum as we are increasingly asked to communicate effectively with local and national legislators. As biology instructors, however, we may choose to teach biology devoid of social context, believing that students can make these connections on their own. But students model their instructors' behaviors, and follow their lead. If we integrate social issues into the biology curriculum, we model social responsibility for biology majors, and we demonstrate the need for biological literacy for nonmajors.
With an ever expanding biology curriculum, some instructors may wonder how they will find space to bring in social issues, and what biological content may be omitted in the process. By strategically embedding social context into those topics that are traditionally reviewed in multiple biology courses we sacrifice little time and content, and allow students to reflect on that social context more than once. By extending the Biological Concepts Framework (Khodar et al., 2004) to issues of social relevance, we may improve student learning retention, since each concept has multiple points of entry, and therefore, multiple points of interest that can serve as avenues for the retrieval of information. Using real-world problems to thread a number of biological concepts together encourages students to move away from seeing biology as a collection of disparate concepts, subject areas, or chapters from textbooks that are far removed from society. This cues them to make connections to biology during their study of nonbiological disciplines. This approach leads to reinforcement of the social connection and to the development of a habit of mind that students can carry forward as they progress through a 4-yr curriculum and beyond.
Recent reports on science education reform promote this pedagogical approach because it prepares students to grapple with the interdisciplinary nature of twenty-first century problems (National Research Council [NRC], 2005). Integrative learning is listed as one of four essential learning outcomes in the "Learning for the New Global Century report." The "Integrative Learning Project," initiated by the American Association of Colleges and Universities (AAC&U; 2007) and the Carnegie Foundation for the Advancement of Teaching, provides practical resources for achieving these goals (AAC&U and Carnegie Foundation, 2007). This shift in emphasis from disciplinary to integrative learning stems from research in cognitive science that demonstrates how students' previous knowledge can influence how they organize and link new information, constructing "schemas" that are deeply rooted in personal and cultural experiences (Vygotsky, 1978; Ausubel et al., 1978; Lattuca et al., 2004). With this in mind, this feature first demonstrates the important connection between biology and social issues, and then examines how the history of biology can be used to infuse relevance into the biology curriculum.
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CONNECTING BIOLOGICAL CONTENT KNOWLEDGE TO SOCIAL ISSUES |
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Sickle Cell Anemia: Multiple Points of Connection
Though sickle cell anemia (SCA) is used to illustrate a variety of complex biological concepts in a variety of courses (genetics, evolution, biochemistry, physiology), few biology courses place this topic in broad social context. Developmental gene regulation, genotype–phenotype relationships, protein polymerization, cooperative binding, and balanced polymorphisms as they relate to evolution can all be illustrated using SCA as an example. But without the social context, students may leave the classroom with misconceptions about allele frequency and distribution, and believe that these concepts are of little importance in the real world. We can use the social history surrounding the development of the molecular diagnostic for SCA and its subsequent use in genetic screening programs in the United States as a vehicle to teach these biological concepts. By doing so, we strengthen the connection between these different biological concepts, and we also demonstrate how biology taken out of social context can lead to widescale social injustice.
To understand how biology instructors might use SCA genetic testing programs to contextualize basic biological principles and concepts, we must first take a look at the social issues that have surrounded these programs. Legislation for SCA genetic screening has shifted over the last 40 years from mandatory state laws, to a voluntary national program, to genetic testing of employees by government employers without informed consent (Bowman, 1977; Markel, 1997). In all of these cases, the target population for screening is African American, despite the fact that the sickle cell allele is not restricted to this racially defined group (Markel, 1997). This misconception was furthered by statements made by President Nixon when he reasoned in 1972 that the National Sickle Cell Control Act was necessary to eliminate a neglected disease that "strikes Blacks and no one else" (Nixon, 1972; P.L. 92–294). Though the Black Panther Party fully supported the SCA Control Act, believing that it would promote better health in their communities, the Act resulted in mass discrimination against African Americans in the United States, many of whom lost health and life insurance, access to public schools, and jobs (Culliton, 1972; Bowman, 1977). This screening program serves as one of the best historical examples of a genetic test gone wrong and continues to haunt African Americans today, as it is maintained on the New York state marriage license application (13aa) and has surfaced in court cases surrounding genetic testing in the workplace (Bowman, 2000; Carroll and Coleman, 2001; Louisana State University, 1998; Norman-Bloodshaw v. Lawrence Berkeley Labs, 135 F3d 1260, 9th Circuit, 1998).
Perhaps surprising to scientists is that Nobel Laureate Linus Pauling, one of the pioneers involved in establishing the first molecular test for SCA, was an advocate of the screening programs that resulted in discriminatory practices. Most scientists remember Pauling as a staunch dissenter of nuclear energy research because of its potential to cause human suffering. On the issue of SCA screening and family planning, Pauling believed here, too, that he could prevent human suffering, as demonstrated by the following quote:
There should be tattooed on the forehead of every young person, a symbol showing possession of the sickle cell gene [so as to prevent] two young people carrying the same seriously defective gene in single dose from falling in love with one another.– Linus Pauling (Markel, 1997)
To include Pauling's position in our teaching is important for a number of reasons. By acknowledging this history, we can examine how biological discoveries and their applications can be shaped by social prejudices of the time (Table 1, SCA). We also illustrate how Pauling's reputation as a scientist and, thus, a person of authority, was used by others to support a policy that resulted in social injustice. In asking students to analyze Pauling's quote, we encourage them to consider what role they will play in communicating and situating their work in the public domain. This is particularly important to the SCA case, as many healthcare providers were unaware of their misunderstanding of the molecular biology behind the SCA diagnostic, which resulted in miscommunication of disease status. This confusion was partly due to a shift from cytological screening to molecular screening via hemoglobin solubility assays. Because physicians were not accustomed to viewing phenotypes at both the molecular and organism level, nomenclature became problematic. The government, the medical community, and the general public began to conflate the carrier status of "sickle cell trait" with sickle cell disease (Markel, 1997).
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The Lac Operon and Energetics: The Evolution of New Products
The social history of SCA screening programs resonates with the diverse undergraduate population of the United States, but serves as only one example of how contextualization of biology curricula can be achieved. Another example that is pervasive in the biology curriculum is the lac operon. Though we ask students to understand the detailed regulation of this operon, its significance is often not clear for students, though many social connections exist. The high frequency of global lactose intolerance can serve as a jumping-off point for discussions about developmental gene regulation in the infant and the adult, different evolutionary outcomes for adult lactase expression based on the domesticated livestock practices of Northern Europeans and some African tribes, and the emergence of probiotic products designed to address the lactose intolerance phenotype of some individuals (Gibbons, 2006; Tishkoff et al., 2007; Stanford University, Human Biology Core Course, www.stanford.edu/dept/humbio/cgi-bin/?Q=node/177).
By juxtaposing prokaryotic and eukaryotic lactase expression in this context, students gain a more comprehensive understanding of gene regulation and are less likely to confuse the two, or perhaps may even see where they share structural similarities (operons and miRNA precursor clusters). They will also learn that though prokaryotes and eukaryotes evolved different mechanisms of genetic control, human consumption of milk and probiotics can influence gene regulation (Enattah et al., 2002). Examination of these macro-scale environmental conditions highlights the intimate connection between genes and environment (Wade, 2006). This connection can be placed within the larger biological conceptual framework of combinatorial control, by revisiting SCA experimental treatments that exploit the natural developmental shift from β-globin fetal gene expression to adult β-globin gene expression. By juxtaposing the SCA and lactase examples, students become better able to recognize common themes such as environmental influence on gene expression and to consider different levels of environmental scale.
Instructors could delve deeper into the social implications of biological knowledge by pointing to the recent development of DNA tests for lactose intolerance, or lawsuits brought against Dannon for false advertising associated with their probiotic yogurt products (Business Wire, 2008, Wade, 2002). Here, instructors can highlight the work of members of the American Society of Microbiology who released a report titled "Probiotic Microbes: The Scientific Basics" that was used in litigation against Dannon.
This report illustrates the social responsibility of professional science organizations. Integrating the report into a biology curriculum allows students to explore the allegations from the biological perspective, provides them with an opportunity to apply knowledge learned, and encourages them to pay attention to the interplay between biology and society (Walker and Buckley, 2006).
Another common biological subject area is energetics. Here, too, students may memorize the metabolic by-products of glycolysis and respiration, but never understand why these pathways are important to other subject areas such as oncogenesis. Instructors can point to the relevance of energetics by using a PET scan image to demonstrate how cells respond to their environments. Cancer cells devoid of blood-flow increase glucose uptake as they switch from respiration to glycolysis in an effort to compensate for the lack of oxygen and in response to the less efficient ATP production via glycolysis. Understanding why some tumors promote the development of blood vessels, while others do not, relates back to the relationship between genes and environment. Students can connect this material to the larger biological concept of environmental control of gene expression at yet another level of scale—that of the localized extracellular environment. The social connection can be extended by pointing to Judah Folkman's work on angiogenesis and the subsequent development of anticancer drugs based on this work (Wade, 1997).
The above examples illustrate how biology instructors can take traditional topics and place them in historical and contemporary context, bringing in other important overarching biological concepts such as evolution and gene–environment interactions, while highlighting the work of significant figures in the field of biology.
Large-Scale Efforts to Infuse Social Context into Biology Teaching
A number of institutions have used the approach of highlighting the relevance of biology to everyday life in an effort to influence students' choice of majors and careers. Tribal colleges, such as Oglala Lakota College and the Universidad Metropolitana (Puerto Rico) were selected as Model Institutions of Excellence by the National Science Foundation (NSF), increasing their graduation of science, technology, engineering, and mathematics (STEM) majors by 44% over a 10-yr period. This was accomplished by developing courses that orient the curriculum to local place and culture (Amber, 1998; NSF, 2007). In a similar effort, faculty at Evergreen State College, Longhouse, developed "The Enduring Legacies Native Cases" that have a strong focus on land rites, indigenous knowledge, and environmental sciences (Enduring Legacies Native Cases, www.evergreen.edu/tribal/cases/index.htm). Whittier College requires all undergraduates to complete a three-semester math and science sequence that culminates in a capstone course titled "Math and Science in Context," which is focused on global problems and prepares students to be informed citizen-leaders (Whittier College, www.whittier.edu/oldsite/science-math/default.htm). In 2001, an international effort to bring together scientists interested in connecting their work to societal problems was initiated by members of Science Education for New Civic Engagements and Responsibilities (SENCER). Members have developed model courses for majors and nonmajors that are disseminated through their website, a newsletter, faculty development workshops, and more recently through a fellows program (SENCER, 2008). Collectively, these efforts strive to produce citizen-biologists and galvanize students to take an active role in promoting biological research as they move through their careers (Table 2).
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USING THE HISTORY OF BIOLOGY TO HIGHLIGHT SOCIAL CONTEXT |
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The History of Evolutionary Theory
A careful selection of topics from the historical record can be used to enhance student learning, but since time and space are limited in our courses, we must be judicious in our choices. In 2003, a working group of biologists was asked to define four or five central biological concepts that should be taught in every undergraduate biology course for the Steering Committee on Criteria and Benchmarks for Increased Learning from Undergraduate STEM Instruction (NRC, 2003). After many hours of deliberation, the group reported that evolution was the only concept common to all biology courses, and that other concepts (i.e., germ theory, cell theory, energetics, the central dogma) should be taught in courses that specifically require this knowledge. Given this outcome, it seems that it would be wise to teach the historical development of evolutionary theory, as this theory is the foundation of all of biology.
Though most biology educators have no formal training in the history of biology, we are fortunate to have access to many resources that highlight the significant events and people that have shaped evolutionary thought. Excellent sources that critically evaluate the contributions of scholars to the theory of evolution include "Evolution for Teachers" produced by PBS, the "Understanding Evolution" project hosted by The University of California (UC) at Berkeley, and Robert Young's online book Darwin's Metaphor: Nature's Place in Victorian Culture (Table 3). These resources acknowledge that ideas from other disciplines were essential to the development of evolutionary theory. The UC Berkeley site offers a concept map superimposed over a timeline that demonstrates the four disciplinary areas that contributed to our current understanding of evolution. In Young's book, excerpts from Darwin's Origin of the Species, Charles Lyell's Principles of Geology, and Thomas Malthus' An Essay on the Principle of Population are analyzed for commonalities. By viewing these excerpts together in one text, students learn that though Darwin was focused on the process of animal speciation, it was Malthus' work on economics and the social condition that ultimately propelled Darwin to make the leap from artificial selection to natural selection. Social philosopher Herbert Spencer then adapted the concept and coined the phrase "survival of the fittest" in Principles of Biology published in 1864. These resources naturally lead to conversations about "Social Darwinism" and the subsequent development of social eugenics practices in the United States, which can be illustrated by images from the "Eugenics Image Archive" hosted by the Dolan DNA Learning Center (Table 3). As evolution is the one guiding principle of all of biology, it is important that students be aware of the historical underpinnings of this theory, and recognize that even today there is debate about which biological phenomena contribute the most to speciation. The latter topic is brought to view more directly in a recent book that focuses on the contributions of horizontal gene transfer (Margulis and Sagan, 2003).
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A Word of Caution in Using the History of Biology to Teach Discovery
A paper titled "How Not to Teach History of Science," cautions educators from using history as a tool to view science as "triumphant discovery" or "pathological error" (Allchin, 2000). To suggest that some scientists in the past are "losers" rather than contributors to a larger field of study results in three negative outcomes: It suggests that there is a "right answer," that any results that don't move the investigator closer to this predicted and defined answer are useless, and that biology is static. One of the most famous "losers" depicted in biology textbooks is Jean-Baptiste Lamarck. A biased representation of Lamarck is strengthened when he is pitted against Charles Darwin. However, Lamarck and Darwin did not see their theories of evolution as mutually exclusive, and more recently Lamarck's work has been resurrected by a better understanding of how environmental factors can impact epigenetic modification of the genome. By using these theories together rather than in opposition, instructors can emphasize the importance of context in determining when, and how, these theories explain various biological phenomena. A multiplicity of approaches in addressing the same problem is useful because it gives students permission to be more courageous in putting forth new ideas.
One will also want to refrain from teaching "cookbook history," presenting biological research or discoveries outside of their historical contexts (Allchin, 2000). When students read "historical" texts, they might criticize the experimental approach of a biologist, but use present day knowledge to do so. To help students place themselves back in time, one can use an excellent set of historical biographies in Microbe Hunters, originally published in 1928 (Table 3). The author uses language that was appropriate for the time, and though he may embellish here and there, he captures the personalities as well as the political and national alliances of various cell biologists (Summers, 1998). One important characteristic of these narratives is that they are not shy about highlighting the "pathological error" associated with a need to be "right," and the frustrations that accompany experimentation that did not go as planned (see Koch and Metchnikoff chapters). When asking students to reflect on how these historical figures could have improved their experimental models, they must be reminded to stay true to the technologies and knowledge available at that point in time. These stories can be further contextualized using other articles that delve deeper into the social context. In the case of Louis Pasteur and Robert Koch, case studies show how the politics of war ignited animosity between individuals and competing schools of thought with respect to public health practices (Ullmann, 2007). Collectively these perspectives illustrate that technology is an important tool, and can be a driver or limiting factor in biological discovery.
Lastly, we recommend moving away from using history to showcase biological discoveries as products of serendipity, as it may convince students that biology is not about good experimentation but rather dumb luck. If we make a conscious effort to demonstrate that knowledge is built over time by multiple researchers who take years to acquire their expertise, students may be less inclined to rush toward finding the answers to problems, and spend time on meaningful observations and analysis. Timelines that display the contributions of multiple disciplines to one major discovery, such as DNA being the molecule of heredity, illustrate the power of integration and the vast amount of expertise needed to arrive at this finding (Figure 1, class-constructed timeline; Figure 2, student-constructed timeline). Historical sources and timelines highlight one of the most influential factors of biological discovery, which is not serendipity, but sagacity—the ability through experience to distinguish meaningful deviations from experimental noise or human error (Gest, 1997).
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WHAT INTEGRATION CAN LOOK LIKE |
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The Cell Biology for Life (CBL) project (referenced in Table 2) has been developed in an effort to share educational resources that integrate the people, history, and social issues of biology with appropriate assessments and evaluation, and is described here as an example of what this approach can look like in practice. CBL is a collection of modules centered on case-based teaching and learning that uses three contemporary topics to teach basic cell biology concepts and methods. Each module focuses on an area of biological research with multiple avenues of social relevance: botulinum toxin and secretion, stem cell research and cell signaling, and the human papillomavirus (HPV) and its association with oncogenesis. Together, the CBL modules cover more than half of the material in a standard cell biology course. Used in succession, they move from basic cell biology to more sophisticated cell biology. Students learn about cell structures, cell division, and cell differentiation in the stem cell module, and are introduced to prokaryotic cells and specialized cell processes such as neurotransmission and muscle contraction in the botulinum toxin module. Students also investigate the role that genetics and viruses play in cell pathology in the HPV module. These fundamental biological principles and methods are placed in social contexts: stem cell research and its use in screening drugs and toxins, and the ethical dilemmas surrounding oocyte donation and embryo termination; botulinum toxin and its application in medicine, esthetics, and biowarfare; and HPV diagnostics, vaccines, and cervical cancer treatments that infringe on indigenous knowledge.
To help instructors teach this contextual material and assess student learning, each CBL module contains a primer that reviews the history, science, and social issues of the topic. The primers contain a set of multimedia and literature resources organized by subject, teaching notes that point to relevant book chapters from texts published by Garland Science, assignments and assessments that promote active student learning through primary literature, and a set of password-protected answer keys. By joining the elements of CBL with traditional methods of teaching, instructors can provide students with the opportunity to see the social implications of conducting biological research, and to develop the skills necessary to become contributive members of society.
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RELEVANCE AND APPROPRIATE ASSESSMENT |
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Assessment of integrative learning can take on many forms, some of which may seem unfamiliar to both instructors and students. The use of analytical rubrics will greatly improve clear communication of learning outcomes and goals and are often used for performance assessments that mimic professional activities, such as grant writing, panel participation, and peer review (Allen and Tanner, 2006). These assignments gauge biological content knowledge, application of knowledge, and the impact of that knowledge on society. A method that has been adopted by some biology educators requires students to use and translate their content knowledge to actions aimed at influencing social policy. An example of this is the sending of letters to legislators or written statements that serve as platforms for a mock community forum (Ebert-May et al., 1997; Chamany, Table 2). One educator asked students to submit term papers on various perspectives of stem cell research that eventually shaped a compendium reader for a traditional developmental biology textbook (Gilbert et al., 2005; Table 2).
In large-sized classes, where exams are used to evaluate student learning, social context and history can be integrated with more traditional lines of questioning. For example, an exam on the principles of evolution can ask students to address the contributions or challenges from other disciplines to the theory of evolution. By asking students to recall the individuals and theories that challenge Charles Darwin and Alfred Wallace's proposed mechanisms of evolution, they are reminded that biological knowledge is constructed by people, and that theories and proposed mechanisms continue to shift over time.
A rigorous exam question can inspire student learning, especially if students have not seen the context in class before. An example of this type of question is shown in Box 1, which assesses student knowledge about basic principles of the central dogma using the socially relevant topic of HPV diagnostics, visual screening practices, vaccination, and treatment. This question could easily be transformed into a series of multiple-choice questions that evaluate the student's ability to synthesize knowledge.
| Box 1. Example of Final Exam Question in Cell Biology Course Recently, cervical cancer screening has been approached via an HPV diagnostic that detects the presence of HPV (Digene Hybrid Capture test). We also know that some types of HPV promote cancer more than others because they carry different variants of the E6 and E7 protein (for instance HPV 16 carries genetic variants that code for E6 and E7 that bind tightly to the host proteins that normally regulate cancer development). Some would argue that screening women for high-risk HPV DNA is not helpful, as it will not definitively distinguish who is at risk for cancer. On May 10, 2005, Molden et al. published a paper announcing the use of a "PreTect HPV-Proofer" diagnostic test that detects mRNA rather than DNA.
In this question, no memorization of specific proteins or technologies is required as the detailed information is provided. Rather, students were asked to evaluate and select the best approach in different situations. Students had been exposed to three modules from CBL (Table 2) and were asked to focus on concepts instead of details. The question evaluates a student's ability to apply concepts related to genetic diversity (b and d), gene expression (c), and gene–environment interactions (e). The question also addresses history and application of biological knowledge to society (a) in a global context (f). This latter subquestion also asks students to consider indigenous low-cost and low-tech approaches that might be more suitable for countries with limited resources, including visual inspection acetic acid analysis and cervical cancer treatment with curcumin (active ingredient of tumeric). The last subquestion (g) asks students to integrate knowledge from previous modules that focused on signal transduction, cell surface markers, and gene therapy techniques using chimeric proteins.
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Integrating the social context and the history of biology in assessment and evaluation of student learning demonstrates that these perspectives are integral to biology learning and not simply entertaining asides for class sessions. This approach also suggests that we expect students to be able to continue making these connections, and that this is an essential skill for all members of society, be they biology researchers, policy makers, or other influential citizens of their local, national, and international communities.
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FOOTNOTES |
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REFERENCES |
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