Introductory Biology Students’ Conceptual Models and Explanations of the Origin of Variation

Mutation is the key molecular mechanism generating phenotypic variation, which is the basis for evolution. In an introductory biology course, we used a model-based pedagogy that enabled students to integrate their understanding of genetics and evolution within multiple case studies. We used student-generated conceptual models to assess understanding of the origin of variation. By midterm, only a small percentage of students articulated complete and accurate representations of the origin of variation in their models. Targeted feedback was offered through activities requiring students to critically evaluate peers’ models. At semester''s end, a substantial proportion of students significantly improved their representation of how variation arises (though one-third still did not include mutation in their models). Students’ written explanations of the origin of variation were mostly consistent with their models, although less effective than models in conveying mechanistic reasoning. This study contributes evidence that articulating the genetic origin of variation is particularly challenging for learners and may require multiple cycles of instruction, assessment, and feedback. To support meaningful learning of the origin of variation, we advocate instruction that explicitly integrates multiple scales of biological organization, assessment that promotes and reveals mechanistic and causal reasoning, and practice with explanatory models with formative feedback.     

Understanding parental views of adolescent sexuality and sex education in Ecuador: a qualitative study

Parents' contribution to sex education is increasingly receiving research attention. This growing interest stems from recognition of the influence that parental attitudes may have both on young people's sexual attitudes and behaviour, and on school-based sex education. Studies regarding parental attitudes towards sexuality are, however, still rare. The two main objectives of this study were to explore parental views about sexuality and to understand parental attitudes towards sex education. Four focus group discussions were conducted with parents from high schools in Cuenca, Ecuador. Data were analysed using thematic analysis. The study revealed that parents held a restricted view about sex education, grounded in traditional religious ideas about sexuality, which led parents to understand it as a morally and physically dangerous activity. Although parents expressed a willingness to make good quality sex education available to their children, they reported having insufficient personal resources to fulfil that objective. The results of this study provide important information about the need to develop and adapt sex education to each specific cultural context, thereby confirming the importance of knowing about the cultural traditions and religious beliefs that may form obstacles to effective sex education for young people in Ecuador.     

Listening text comprehension in preschoolers: a longitudinal study on the role of semantic components

A longitudinal study analyzed (a) which lower- and higher-level semantic components uniquely predicted listening text comprehension and (b) the nature of the relation (i.e., direct and indirect) between the predictors and listening text comprehension in preschoolers. One-hundred and fifty-two children participated in the present study (68 females; mean age = 4;10 years/months and 5;5 years/months at Time 1 and Time 2, respectively). Participants were administered measures to evaluate listening text comprehension (Time 1 and Time 2) and (a) expressive and receptive word knowledge (lower-level semantic components), and (b) inferential skills and the ability to use context (higher-level semantic components) (Time 1). Verbal short-term and working memory were also included as control variables. Data were analyzed using path analysis models. Results showed that both types of semantic components (a) accounted for unique variance in listening text comprehension at Time 2, with lower-level semantic components explaining a larger proportion of variance than higher-level semantic components; (b) were related to later listening text comprehension through direct and indirect relations. Memory resources did not significantly contribute to listening text comprehension. The results are discussed in light of their theoretical relevance and educational/practical implications.     

Roads to Success in the Belgian French Community’s Higher Education System: Predictors of Dropout and Degree Completion at the Université Libre de Bruxelles

In this paper we study the factors that influence both dropout and (4-year) degree completion throughout university by applying the set of discrete-time methods for competing risks in event history analysis, as described in Scott and Kennedy (2005). In the French-speaking Belgian community, participation rates are very high given that higher education is largely financed through public funds, but at the same time, the system performs very poorly in terms of degree completion. In this particular context, we explore two main questions. First, to what extent is socioeconomic background still a determinant of success for academic careers in a system that, by construction, aims to eliminate economic barriers to higher education? Second, given the high proportion of students who fail their first year and are unable to move to their second year, can authorities promote degree completion and decrease dropout among students who have already experienced a failure? Using the competing risks model, we show that in spite of low entry barriers, students coming from lower socioeconomic background are more vulnerable to dropout along the whole academic path because of financial constraints that prevent them from re-enrolling. Also, our results reveal that, after a failed year, a significantly higher proportion of students who re-enroll in a different field obtain a degree compared to those that re-enroll in the same field, suggesting that universities should rethink the mechanisms available to manage failure and guide student choices.     

Balancing Tensions During Convergence: Duality Management in a Newspaper Company

Abstract

Media companies inherently face organizational tensions, as dual—artistic and commercial—orientations are part of their mission. Yet, it is still poorly understood what the existence of such tensions implies for managing media companies that undergo organizational changes to embrace technological convergence. Based on a case study with a European media company, this article argues that different organizational tensions exist and exemplifies this by characterizing structural, processual, and cultural tensions. This study finds that these tensions are interlinked, interdependent, and dynamic—namely, when media companies change, their inherent tensions are also likely to change. Thus, they need to be actively and comprehensively managed to avoid disfunctionalities. In fact, considering the different tensions in the reorganizing process might enhance its chances of success. Relocating the tension, enhancing perception of the tension, and providing training to increase awareness of employees emerge from this case as different strategies for managing tensions.     

Scale of attitudes of schoolchildren towards immigrant pupils

In the academic year 2004–2005, approximately 400,000 immigrant pupils were enrolled in Spanish schools and six-form colleges. The racial and ethnic diversity that Spanish society and schools present could be a source of new opportunities and social enrichment, for the national as well as the immigrant population. However, this contact between nationals and immigrants is not free of problems. School is one of the areas where attitudes towards different social groups begin to be formed, while at the same time being the main opportunity that our society has to create an environment of coexistence and attitudinal change. The first step to look at such a complex phenomenon in more detail is to have evaluation tools available that allow us to measure it. In this article we present the results referring to psychometric features, and we carry out a differential analysis of the Scale of attitudes of school-children towards immigrant pupils.     

Profiles of self-perceived competencies and conceptions of academic writing in university students / Perfiles de competencias y concepciones sobre la escritura académica en estudiantes universitarios

Abstract

This study analyses Spanish undergraduates’ perceptions of their competency in academic writing, as well as their perception of the criteria that define its quality. We identified student profiles and examined their relationship with (1) certain sample characteristics, such as years of university experience, area of study and students’ gender, and (2) variables related to the process of writing, namely the students’ perception of the writing process and the importance they attribute to its characteristics. The data obtained came from the European Writing Survey (EUWRIT) which was administered to 1,044 students from nine Spanish universities. Profiles were identified by means of k-means cluster analysis. The relationship between these profiles and the variables studied was examined by means of chi-squared analyses and univariate ANOVAs. Two profiles were identified: students who are confident about their writing skills and who acknowledge the importance of writing in their field of knowledge; and students who are relatively confident about their writing ability and who consider writing to be relatively important in their subject area.