A Biology Lesson

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Preservice Biology Teachers’ Conceptions About the Tentative Nature of Theories and Models in Biology

In research on the nature of science, there is a need to investigate the role and status of different scientific knowledge forms. Theories and models are two of the most important knowledge forms within biology and are the focus of this study. During interviews, preservice biology teachers (N = 10) were asked about their understanding of theories and models. They were requested to give reasons why they see theories and models as either tentative or certain constructs. Their conceptions were then compared to philosophers’ positions (e.g., Popper, Giere). A category system was developed from the qualitative content analysis of the interviews. These categories include 16 conceptions for theories (n _tentative = 11; n _certain  = 5) and 18 conceptions for models (n _tentative = 10; n _certain = 8). The analysis of the interviews showed that the preservice teachers gave reasons for the tentativeness or certainty of theories and models either due to their understanding of the terms or due to their understanding of the generation or evaluation of theories and models. Therefore, a variety of different terminology, from different sources, should be used in learning-teaching situations. Additionally, an understanding of which processes lead to the generation, evaluation, and refinement or rejection of theories and models should be discussed with preservice teachers. Within philosophy of science, there has been a shift from theories to models. This should be transferred to educational contexts by firstly highlighting the role of models and also their connections to theories.     

Vignettes of Haeckel’s Contributions to Biology

Ernst Haeckel was a very versatile and complete biologist, equally at home with imaginative leaps of conceptualization, serious natural history in the wild, and meticulous experimentation in embryology. His work shaped the development of a holistic evolutionary perspective that brought ecology, ontogeny, phylogeny, and biogeography together into a unified explanation of the patterns of diversity seen in the living world. He, along with Darwin and Mendel, was perhaps one of the three most consequential biologists of the nineteenthcentury, in many ways the golden age of biology.     

“Sex Hormones” in Secondary School Biology Textbooks

This study explores the extent to which the term “sex hormone” is used in science textbooks, and whether the use of the term “sex hormone” is associated with pre-empirical concepts of sex dualism, in particular the misconceptions that these so-called “sex hormones” are sex specific and restricted to sex-related physiological functioning. We found that: (1) all the texts employed the term “sex hormone”; (2) in all texts estrogen is characterized as restricted to females and testosterone is characterized as restricted to males; and (3) in all texts testosterone and estrogen are discussed as exclusively involved in sex-related physiological roles. We conclude that (1) contemporary science textbooks preserve sex-dualistic models of steroid hormones (one sex, one “sex hormone”) that were rejected by medical science in the early 20th century and (2) use of the term “sex hormone” is associated with misconceptions regarding the presence and functions of steroid hormones in male and female bodies.

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Toward Integration: From Quantitative Biology to Mathbio-Biomath?

In response to the call of BIO2010 for integrating quantitative skills into undergraduate biology education, 30 Howard Hughes Medical Institute (HHMI) Program Directors at the 2006 HHMI Program Directors Meeting established a consortium to investigate, implement, develop, and disseminate best practices resulting from the integration of math and biology. With the assistance of an HHMI-funded mini-grant, led by Karl Joplin of East Tennessee State University, and support in institutional HHMI grants at Emory and University of Delaware, these institutions held a series of summer institutes and workshops to document progress toward and address the challenges of implementing a more quantitative approach to undergraduate biology education. This report summarizes the results of the four summer institutes (2007–2010). The group developed four draft white papers, a wiki site, and a listserv. One major outcome of these meetings is this issue of CBE—Life Sciences Education, which resulted from proposals at our 2008 meeting and a January 2009 planning session. Many of the papers in this issue emerged from or were influenced by these meetings.     

Concept Formation in Biology: The Concept ‘Growth’

Summaries

English

A concept is understood here as a logic core, which is surrounded by an associative framework, to which also the name of the concept belongs. The logic core is a pattern of properties of a class of things, which is invariant to individual objects of the class as well as to the observer. The pattern is determined by logic relations, which are constituents of the epistemic structure of the learner.

In this article an analysis of the situation concerning the concept ‘growth’ is carried out. The logic core of the concept is theoretically investigated by means of systems theory and is empirically tested by means of free definitions. The associative framework, however, is determined by means of free association tests.

It is shown that in the course of school education a marked shift takes place in the logic core as well as in the associative framework from a ‘growth in terms of geometric dimension’ towards a ‘growth in terms of particle numbers’.     

Tensions in the Biology Laboratory: What are they?

The purpose of this paper is to identify tensions in teacher–student interaction in a high school biology laboratory. Using micro‐analytic analysis of classroom talk, the interaction between the students and a teacher working in the biology laboratory session on Reproduction in Plants is studied. The two tensions highlighted here are tension with textbooks as authority and tension with the teacher as authority. Tension with textbooks as authority originates from an over‐reliance on generalizations expressed in textbooks resulting in the inability of learners to appreciate alternatives and exceptions. Tension with the teacher as authority stems from the task design and varying levels of control that a teacher has over the learner and the learning process. The genesis of the two forms of tensions in the laboratory is different and they are tackled differently by the participants to yield different outcomes. While science educators have conducted intensive research over the past two decades on the effects of school science laboratory work on students’ learning of science, more can be done in the specific area of teacher–student interaction. This paper offers some insights into the interaction between a teacher and her students in a laboratory as they learn biology. An increased understanding of the impact of the tensions in a science laboratory might help to bring about realization of the true spirit and intent of school science laboratory experiences.     

Characterizing High School Students’ Written Explanations in Biology Laboratories

The purpose of this qualitative interpretive research study was to examine high school students’ written scientific explanations during biology laboratory investigations. Specifically, we characterized the types of epistemologies and forms of reasoning involved in students’ scientific explanations and students’ perceptions of scientific explanations. Sixteen students from a rural high school in the Southeastern United States were the participants of this research study. The data consisted of students’ laboratory reports and individual interviews. The results indicated that students’ explanations were primarily based on first-hand knowledge gained in the science laboratories and mostly representing procedural recounts. Most students did not give explanations based on a theory or a principle and did not use deductive reasoning in their explanations. The students had difficulties explaining phenomena that involved intricate cause–effect relationships. Students perceived scientific explanation as the final step of a scientific inquiry and as an account of what happened in the inquiry process, and held a constructivist–empiricist view of scientific explanations. Our results imply the need for more explicit guidance to help students construct better scientific explanations and explicit teaching of the explanatory genre with particular focus on theoretical and causal explanations.     

Pupil Talk in Biology Practical Work‐‐a preliminary study

The development of a framework for analysing pupil talk is described and the reliability of scoring transcribed conversations using the framework discussed. Preliminary findings from this study on the talk occurring during small group practical work in biology focus on the forms of verbal interaction that occur, patterns of verbal interactions shown by individuals within groups and the possible link between such patterns and roles within the groups.     

Conceptions of Biology and Approaches to Learning of First Year Biology Students: Introducing a technique for tracking changes in learner profiles over time

We surveyed first year students at the start and at the end of their first semester of university biology (n?=?285) as to their approaches to study (surface, deep) and their conceptions of biology (fragmented, cohesive). Hierarchical cluster analysis was used to group students who responded similarly to the survey; this resolved four Learner Profiles based on specific combinations of approach to study and conception of biology. By comparing cluster membership at the start and end of the semester we could assess whether students (1) maintained their incoming approach to study and conception of the discipline of biology, i.e. their ‘Learner Profile’ and (2) whether certain Learner Profiles were more persistent than others. Approximately half the student cohort did not alter their approach to study or conceptions of biology by semester's end. Students in the disengaged profile, i.e. who returned mostly negative responses to survey items, appeared the most resistant to changing their Learner Profile; while the greatest migration occurred towards less than desirable learning strategies (particularly to the disengaged profile). We were able to confirm the significant migration patterns by assessing the heterogeneity of each cluster at the start of semester clusters with respect to the students' approaches and conceptions at the end of semester. Thus we present a process to accurately track Learner Profile changes that may tell us more about how we can enhance students' learning and provide a means by which to gather the empirical data to support decisions relating to curriculum change.     

Mathematical Manipulative Models: In Defense of “Beanbag Biology”

Mathematical manipulative models have had a long history of influence in biological research and in secondary school education, but they are frequently neglected in undergraduate biology education. By linking mathematical manipulative models in a four-step process—1) use of physical manipulatives, 2) interactive exploration of computer simulations, 3) derivation of mathematical relationships from core principles, and 4) analysis of real data sets—we demonstrate a process that we have shared in biological faculty development workshops led by staff from the BioQUEST Curriculum Consortium over the past 24 yr. We built this approach based upon a broad survey of literature in mathematical educational research that has convincingly demonstrated the utility of multiple models that involve physical, kinesthetic learning to actual data and interactive simulations. Two projects that use this approach are introduced: The Biological Excel Simulations and Tools in Exploratory, Experiential Mathematics (ESTEEM) Project (http://bioquest.org/esteem) and Numerical Undergraduate Mathematical Biology Education (NUMB3R5 COUNT; http://bioquest.org/numberscount). Examples here emphasize genetics, ecology, population biology, photosynthesis, cancer, and epidemiology. Mathematical manipulative models help learners break through prior fears to develop an appreciation for how mathematical reasoning informs problem solving, inference, and precise communication in biology and enhance the diversity of quantitative biology education.     

Epistemological Predictors of “Self Efficacy on Learning Biology” and “Test Anxiety Related to Evaluation of Learning on Biology” for Pre-service Elementary Teachers

The degree to which pre-service teachers learn biology is related to both motivational factors of self-regulation and factors regarding epistemological beliefs. At the same time, self-regulation and epistemological beliefs are also associated with one another. Based on this relationship, the purpose of this study was to investigate the relationship between components of epistemological beliefs and self-refulation (self-efficacy and test-anxiety) on learning biology. The study was conducted with 411 pre-service elementary and pre-service elementary science teachers by using a predictive research approach. Collected data was analyzed by the multiple linear regression technique. The results showed that only the belief about “existence of one truth” was a significant predictor of test anxiety while there was no epistemological predictor of self-efficacy. Conclusions and implications of the study will be discussed.     

Exploring Pre-service Biology Teachers’ Informal Reasoning and Decision-Making About COVID-19

Science & Education - The world has been fighting with the novel COVID-19 pandemic, which has scientific, societal, and ethical components, and thus it can be classified as one of the most...     

Perceptual Influence of Ugandan Biology Students’ Understanding of HIV/AIDS

In Uganda, curbing the spread of HIV/AIDS has largely depended on public and private media messages about the disease. Media campaigns based on Uganda’s cultural norms of communication are metaphorical, analogical and simile-like. The topic of HIV/AIDS has been introduced into the Senior Three (Grade 11) biology curriculum in Uganda. To what extent do students’ pre-conceptions of the disease, based on these media messages influence students’ development of conceptual understanding of the disease, its transmission and prevention? Of significant importance is the impact the conceptions students have developed from the indirect media messages on classroom instruction on HIV/AIDS. The study is based in a theoretical framework of conceptual change in science learning. An interpretive case study to determine the impact of Ugandan students’ conceptions or perceptions on classroom instruction about HIV/AIDS, involving 160 students aged 15–17, was conducted in four different Ugandan high schools: girls boarding, boys boarding, mixed boarding, and mixed day. Using questionnaires, focus group discussions, recorded biology lessons and informal interviews, students’ preconceptions of HIV/AIDS and how these impact lessons on HIV/AIDS were discerned. These preconceptions fall into four main categories: religious, political, conspiracy and traditional African worldviews. Results of data analysis suggest that students’ prior knowledge is persistent even after biology instructions. This has implications for current teaching approaches, which are mostly teacher-centred in Ugandan schools. A rethinking of the curriculum with the intent of offering science education programs that promote understanding of the science of HIV/AIDS as opposed to what is happening now—insensitivity to misconceptions about the disease—is needed.     

Pre-service Biology Teachers’ Responses to First-Hand Anomalous Data During Modelling Processes

Research in Science Education - In this research project we investigate the role of responses to anomalous data during modelling processes. Modelling is seen as a comprehensive practice that...     

Team Research at the Biology–Mathematics Interface: Project Management Perspectives

The success of interdisciplinary research teams depends largely upon skills related to team performance. We evaluated student and team performance for undergraduate biology and mathematics students who participated in summer research projects conducted in off-campus laboratories. The student teams were composed of a student with a mathematics background and an experimentally oriented biology student. The team mentors typically ranked the students'' performance very good to excellent over a range of attributes that included creativity and ability to conduct independent research. However, the research teams experienced problems meeting prespecified deadlines due to poor time and project management skills. Because time and project management skills can be readily taught and moreover typically reflect good research practices, simple modifications should be made to undergraduate curricula so that the promise of initiatives, such as MATH-BIO 2010, can be implemented.