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1.
Phylogenetic trees provide visual representations of ancestor–descendant relationships, a core concept of evolutionary theory. We introduced “tree thinking” into our introductory organismal biology course (freshman/sophomore majors) to help teach organismal diversity within an evolutionary framework. Our instructional strategy consisted of designing and implementing a set of experiences to help students learn to read, interpret, and manipulate phylogenetic trees, with a particular emphasis on using data to evaluate alternative phylogenetic hypotheses (trees). To assess the outcomes of these learning experiences, we designed and implemented a Phylogeny Assessment Tool (PhAT), an open-ended response instrument that asked students to: 1) map characters on phylogenetic trees; 2) apply an objective criterion to decide which of two trees (alternative hypotheses) is “better”; and 3) demonstrate understanding of phylogenetic trees as depictions of ancestor–descendant relationships. A pre–post test design was used with the PhAT to collect data from students in two consecutive Fall semesters. Students in both semesters made significant gains in their abilities to map characters onto phylogenetic trees and to choose between two alternative hypotheses of relationship (trees) by applying the principle of parsimony (Occam''s razor). However, learning gains were much lower in the area of student interpretation of phylogenetic trees as representations of ancestor–descendant relationships.  相似文献   

2.
Phylogenetic trees are widely used visual representations in the biological sciences and the most important visual representations in evolutionary biology. Therefore, phylogenetic trees have also become an important component of biology education. We sought to characterize reasoning used by introductory biology students in interpreting taxa relatedness on phylogenetic trees, to measure the prevalence of correct taxa-relatedness interpretations, and to determine how student reasoning and correctness change in response to instruction and over time. Counting synapomorphies and nodes between taxa were the most common forms of incorrect reasoning, which presents a pedagogical dilemma concerning labeled synapomorphies on phylogenetic trees. Students also independently generated an alternative form of correct reasoning using monophyletic groups, the use of which decreased in popularity over time. Approximately half of all students were able to correctly interpret taxa relatedness on phylogenetic trees, and many memorized correct reasoning without understanding its application. Broad initial instruction that allowed students to generate inferences on their own contributed very little to phylogenetic tree understanding, while targeted instruction on evolutionary relationships improved understanding to some extent. Phylogenetic trees, which can directly affect student understanding of evolution, appear to offer introductory biology instructors a formidable pedagogical challenge.  相似文献   

3.
The increased availability of computational modeling software has created opportunities for students to engage in scientific inquiry through constructing computer‐based models of scientific phenomena. However, despite the growing trend of integrating technology into science curricula, educators need to understand what aspects of these technologies promote student learning. This study used a multi‐method research approach involving both quantitative (Paper 1) and qualitative data (Paper 2) to examine student conceptual understanding of astronomical phenomena, relative to two different instructional experiences. Specifically, based on students' understandings of both spatial and declarative knowledge, we compared students who had constructed three‐dimensional computational models with students who had experienced traditional lecture‐based instruction. Quantitative analysis of pre‐interview and post‐interview data revealed that construction of three‐dimensional models best facilitated student understandings of spatially related astronomical concepts — whereas traditional instruction techniques best facilitated student understandings of fact‐oriented astronomical knowledge. This paper is the first in a two‐paper set that continues our line of research into whether problem‐based courses such as the Virtual Solar System course can be used as a viable alternative to traditional lecture‐based astronomy courses.  相似文献   

4.
As the design thinking approach becomes more established in the instructional design (ID) discourse, the field will have to reconsider the professional identity of instructional designers. Rather than passively following models or processes, a professional identity rooted in design thinking calls for instructional designers to be dynamic agents of change who use reflective thinking to navigate the design space and develop solutions to ill-structured problems. Graduate programs in ID will also need to prepare students to manage the complexities they will encounter in their professional practice, including the establishment of design precedents, reflective thinking skills, and the foundations of professional identity. This research explored the use of reflective writing assignments in an introductory ID graduate course, with results indicating that most students are able to engage in meaningful reflection in relation to prompts concerning design concepts, experiences, and identity attributes, although no clear patterns of improvement emerged over time. Future directions for research include the use of feedback and the structure of prompts (including frequency of writing assignments and wording of prompts) to support improved student performance.  相似文献   

5.
Density has been reported as one of the most difficult concepts for secondary school students (e.g. Smith et al. 1997). Discussion about the difficulties of learning this concept has been largely focused on the complexity of the concept itself or student misconceptions. Few, if any, have investigated how the concept of density was constituted in classroom interactions, and what consequences these interactions have for individual students?? conceptual understanding. This paper reports a detailed analysis of two lessons on density in a 7th Grade Australian science classroom, employing the theory of Distributed Cognition (Hollan et al. 1999; Hutchins 1995). The analysis demonstrated that student understanding of density was shaped strongly by the public classroom discussion on the density of two metal blocks. It also revealed the ambiguities associated with the teacher demonstration and the student practical work. These ambiguities contributed to student difficulties with the concept of density identified in this classroom. The results of this study suggest that deliberate effort is needed to establish shared understanding not only about the purpose of the activities, but also about the meaning of scientific language and the utility of tools. It also suggests the importance of appropriate employment of instructional resources in order to facilitate student scientific understanding.  相似文献   

6.
This paper explores the nature and source of mathematics homework and teachers’ and students’ perspectives about the role of mathematics homework. The subjects of the study are three grade 8 mathematics teachers and 115 of their students. Data from field notes, teacher interviews and student questionnaire are analysed using qualitative methods. The findings show that all 3 teachers gave their students homework for instructional purposes to engage them in consolidating what they were taught in class as well as prepare them for upcoming tests and examinations. The homework only involved paper and pencil, was compulsory, homogenous for the whole class and meant for individual work. The main source of homework assignments was the textbook that the students used for the study of mathematics at school. ‘Practice makes perfect’ appeared to be the underlying belief of all 3 teachers when rationalising why they gave their students homework. From the perspective of the teachers, the role of homework was mainly to hone skills and comprehend concepts, extend their ‘seatwork into out of class time’ and cultivate a sense of responsibility. From the perspectives of the students, homework served 6 functions, namely improving/enhancing understanding of mathematics concepts, revising/practising the topic taught, improving problem-solving skills, preparing for test/examination, assessing understanding/learning from mistakes and extending mathematical knowledge.  相似文献   

7.

Those of us who teach computer science courses, especially upper division courses, face a difficult pedagogical problem. What kind of activities can we provide that will help our students progress beyond the superficial level of learning yet another collection of disjointed facts and procedures? The literature on writing strongly suggests that writing assignments can help the students master difficult concepts and develop the higher level skills that should be part of their education. Short, narrowly focused writing assignments have been used effectively to supplement a wide range of computer science courses. Holistic grading and follow‐up discussions can reduce the grading burden without sacrificing the quality of the feedback.  相似文献   

8.
The ability to interpret experimental data is essential to understanding and participating in the process of scientific discovery. Reading primary research articles can be a frustrating experience for undergraduate biology students because they have very little experience interpreting data. To enhance their data interpretation skills, students used a template called “Figure Facts” to assist them with primary literature–based reading assignments in an advanced cellular neuroscience course. The Figure Facts template encourages students to adopt a data-centric approach, rather than a text-based approach, to understand research articles. Specifically, Figure Facts requires students to focus on the experimental data presented in each figure and identify specific conclusions that may be drawn from those results. Students who used Figure Facts for one semester increased the amount of time they spent examining figures in a primary research article, and regular exposure to primary literature was associated with improved student performance on a data interpretation skills test. Students reported decreased frustration associated with interpreting data figures, and their opinions of the Figure Facts template were overwhelmingly positive. In this paper, we present Figure Facts for others to adopt and adapt, with reflection on its implementation and effectiveness in improving undergraduate science education.  相似文献   

9.
Abstract

Textual plagiarism is a serious violation of established academic protocols, but it requires considerable writing experience and care to avoid as well. Although student understanding of textual plagiarism and their plagiaristic behaviour in English as a Second Language (ESL) and English as a Foreign Language (EFL) contexts have been quite well researched, few studies have sought to evaluate instructional interventions specifically designed to reduce plagiarism by empowering student writers with a better knowledge of plagiarism and skills at source referencing. To the best of our knowledge, no study to date has ever systematically assessed students’ understanding of plagiarism and their source referencing performance in response to intervention. This classroom-based research, at a university in Beijing, aimed to discover whether a 6-hour block of instruction could facilitate better understanding of plagiarism and appropriate source referencing skills. The results showed that the intervention did generally give students a better appreciation of how textual plagiarism looks and significantly reduced blatant and subtle plagiarism in their writing. However, students’ heavy reliance on original source language did frequently reoccur in student writing if in less clear-cut ways. Some helpful lessons were drawn from this study.  相似文献   

10.
Abstract

The effects of different types of review questions and the use of review passages on transfer skills were examined. Sixty seventh grade students were randomly assigned to each experimental group. Each student studied instructional materials on modulo seven addition and subtraction. Each student was then given a test that included lateral and vertical transfer problems. The results showed significant effects of word-type questions on vertical transfer skills and significant interaction effects between question types and the use of review passages on transfer skills. The cognitive strategy established by working relatively difficult review questions seemed to enable students to retain higher-level transfer skills.  相似文献   

11.
Students’ perceptions of engineering have been documented through studies involving interviews, surveys, and word associations that take a direct approach to asking students about various aspects of their understanding of engineering. Research on perceptions of engineering rarely focuses on how students would portray engineering to others. First-year engineering student teams proposed a museum exhibit, targeted to middle school students, to explore the question “What is engineering?” The proposals took the form of a poster. The overarching research question focuses on how these students would portray engineering to middle school students as seen through their museum exhibit proposals. A preliminary analysis was done on 357 posters to determine the overall engineering themes for the proposed museum exhibits. Forty of these posters were selected and, using open coding, more thoroughly analyzed to learn what artifacts/objects, concepts, and skills student teams associate with engineering. These posters were also analyzed to determine if there were any differences by gender composition of the student teams. Building, designing, and teamwork are skills the first-year engineering students link to engineering. Regarding artifacts, students mentioned those related to transportation and structures most often. All-male teams were more likely to focus on the idea of space and to mention teamwork and designing as engineering skills; equal-gender teams were more likely to focus on the multidisciplinary aspect of engineering. This analysis of student teams’ proposals provides baseline data, positioning instructors to develop and assess instructional interventions that stretch students’ self-exploration of engineering.  相似文献   

12.
We describe the development of a course to teach modeling and mathematical analysis skills to students of biology and to teach biology to students with strong backgrounds in mathematics, physics, or engineering. The two groups of students have different ways of learning material and often have strong negative feelings toward the area of knowledge that they find difficult. To give students a sense of mastery in each area, several complementary approaches are used in the course: 1) a “live” textbook that allows students to explore models and mathematical processes interactively; 2) benchmark problems providing key skills on which students make continuous progress; 3) assignment of students to teams of two throughout the semester; 4) regular one-on-one interactions with instructors throughout the semester; and 5) a term project in which students reconstruct, analyze, extend, and then write in detail about a recently published biological model. Based on student evaluations and comments, an attitude survey, and the quality of the students'' term papers, the course has significantly increased the ability and willingness of biology students to use mathematical concepts and modeling tools to understand biological systems, and it has significantly enhanced engineering students'' appreciation of biology.  相似文献   

13.
We designed Knowledge Integration Environment (KIE) debate projects to take advantage of internet resources and promote student understanding of science. Design decisions were guided by the Scaffolded Knowledge Integration instructional framework. We report on design studies that test and elaborate on our instructional framework. Our learning studies assess the arguments students construct using the Knowledge Integration Environment debate project about light propagation and, explore the relationship between students' views of the nature of science and argument construction. We examine how students use evidence, determine when they add further ideas and claims and measure progress in understanding light propagation. To a modeate degree, students' views of the nature of science align with the quality of the arguments.  相似文献   

14.
This case study examines the benefits of integrating wikis into the World History curriculum. Six middle school students chosen because of their designation in relevant subgroups—GATE, AVID, and RSP—participated in this 20-week study. Abstract historical concepts can be difficult to grasp; therefore, students collaborated via a wiki on topics that required students to practice historical analysis skills that are utilized by historians and social scientists who are experts in their field. Historical and social science analysis skills add rigor to the curriculum as students develop a deeper understanding of historical events beyond the core curriculum. Findings indicate that students, when given the option, chose to use higher order thinking skills. The high number of responses by the RSP students was a surprising outcome. The data indicates that wikis foster collaborative learning, interaction, and natural student inquiry.  相似文献   

15.
Writing assignments, including note taking and written recall, should enhance retention of knowledge, whereas analytical writing tasks with metacognitive aspects should enhance higher-order thinking. In this study, we assessed how certain writing-intensive “interventions,” such as written exam corrections and peer-reviewed writing assignments using Calibrated Peer Review and including a metacognitive component, improve student learning. We designed and tested the possible benefits of these approaches using control and experimental variables across and between our three-section introductory biology course. Based on assessment, students who corrected exam questions showed significant improvement on postexam assessment compared with their nonparticipating peers. Differences were also observed between students participating in written and discussion-based exercises. Students with low ACT scores benefited equally from written and discussion-based exam corrections, whereas students with midrange to high ACT scores benefited more from written than discussion-based exam corrections. Students scored higher on topics learned via peer-reviewed writing assignments relative to learning in an active classroom discussion or traditional lecture. However, students with low ACT scores (17–23) did not show the same benefit from peer-reviewed written essays as the other students. These changes offer significant student learning benefits with minimal additional effort by the instructors.  相似文献   

16.
Conclusion Teaching needs to be studied in context, as a whole. This approach would require the student to spend much time in classrooms and in reflection. The STF is a learning environment which while not replacing actual teaching experience, can support that experience and allow students to maximise the benefit of the time they do have in the classroom. Students can learn about instructional strategies in a classroom context, tapping into an experienced teacher's knowledge and experience. The motivation for creating the STF was not to ‘teach’ the students the ‘correct’ strategies to use in the classroom, but to support them in constructing and testing their own understanding of the instructional strategies in a classroom context. The next phase of the project will be trials of the STF with pre-service primary teaching students. A copy of the prototype will be installed at Newling Primary School so that the teachers there can become familiar with the project and offer comment. After this exposure to the concept, a survey will be conducted to determine the structure and content of an STF which would support in-service training. Specializations science education, senior secondary students' understanding of biological concepts, applications of multimedia.  相似文献   

17.
This paper looks at the need for a better understanding of the impediments to critical thinking in relation to graduate student work. The paper argues that a distinction is needed between two vectors that influence student writing: (1) the word-level–sentence-level vector; and (2) the grammar–inferencing vector. It is suggested that much of the work being done to assist students is only done on the first vector. This paper suggests a combination of explicit use of deductive syllogistic inferences and computer-aided argument mapping is needed. A methodology is suggested for tackling assignments that require students to ‘make an argument’. It is argued that what lecturers understand tacitly, now needs to be made a focus of deliberate educational practices.  相似文献   

18.
Many introductory biochemistry students have problems understanding metabolism and acquiring the skills necessary to study metabolic pathways. In this paper we suggest that this may be largely due to the use of a traditional teaching approach which emphasises memorisation rather than understanding. We present an alternative approach to teaching carbohydrate metabolism which is designed to promote understanding of pathways. The approach also enables regular monitoring of, and reflection on, student progress and the identification of student reasoning and conceptual difficulties through the use of specially designed problems. Preliminary results are presented giving examples of specific student difficulties and the extent to which they were addressed by the alternative instructional approach. A qualitative evaluation of the approach is also presented. Specializations: metal accumulating plants biochemical education. Specializations: physics education, conceptual development, instructional design, improvement of tertiary science education.  相似文献   

19.
Research Findings: This study investigates the role of fine motor and mathematics instruction in mathematics achievement in an international sample of kindergarteners from the United States and China. Multilevel modeling was used to assess the interaction between students’ entering skills and classroom time spent on basic math, higher-order math and fine-motor instruction. For American children, the effect of basic math and higher-order math instruction on student achievement depended on entering skills; however, fine motor instruction had negative average effects on student achievement and did not depend on students’ entering skills. Instruction time was not a significant predictor of achievement for Chinese students. Practice or Policy: Though fine motor skills have a robust correlation with mathematics achievement, a causal link has not been established. Our study indicates that time spent in fine motor instruction does not advance mathematics achievement in kindergarten and in fact may weaken mathematics achievement, given the limited time in the instructional day. American teachers in our sample who spent more time in fine-motor instruction tended to spend less time on basic math and higher-order mathematics instruction. Educators should weigh instructional trade-offs carefully and work to tailor instruction to students’ skill levels.  相似文献   

20.
Word play is an important skill allowing product names, show titles, jokes, poetry and other writings or orations to be interesting, entertaining and well-remembered. This pretest–posttest counterbalanced study compared two instructional approaches for teaching second and third grade students (n = 71) word play skills. Students at a public elementary school in Iowa, United States studied vowel patterns and rhyming as part of the regular school curriculum for literacy through two conditions: a traditional format of reading, pocket charts, worksheets and oral discussion; versus a more concrete approach of arranging objects and corresponding word cards in a chart-like formation. There was no significant difference in student performance between the conditions but an attitude survey indicated that a large majority of students preferred the object boxes for understanding of word play concepts and task enjoyment.  相似文献   

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