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Scientific teleological explanations cite end states as causes to account for physical phenomena. Researchers in science education have noted that students can use teleological explanations in ways that are illegitimate, for example, by implying that inanimate objects are acting intentionally. Despite such cases, several examples of legitimate teleological explanation have been described, and the use of the explanatory form in several contexts in biological education has been encouraged. We argue that, in addition to those biological cases, teleological accounts that meet two criteria can be a legitimate and valuable tool in physics education. We propose that teleological accounts are legitimate when, first, the account reflects the cause-and-effect relationships that exist in reality and, second, when the end state has a degree of necessity. Our account is based on Lange's model of constraint-based causality, in which he argues that phenomena can be explained by reference to constraints, necessary restrictions, for example, physical laws, that limit the behaviour of phenomena. We introduce seven examples of constraint-based teleology in the context of physics education and consider to what extent the two criteria are met in each case and hence their legitimacy. Five potential criticisms of the approach are introduced, discussed, and dismissed. Strategies for using legitimate teleological explanations in the physics classroom are proposed.

Biology education research has shown that deeply rooted intuitions can influence students' understanding of biological phenomena. One example is design teleology, the intuition that organisms' traits were designed to fulfill a goal. Another example is psychological essentialism, the intuition that organisms have fixed essences. Past research has found both of these intuitions to be conceptual obstacles for understanding evolution. In our study, we investigated whether conceptions stemming from these two intuitions are also expressed in the context of genetics. So, we used two tests to identify teleology and essentialism conceptions in the context of genetics: a multiple-choice questionnaire (Genetic Essentialism and Teleology Questionnaire) and an implicit test (Genetic Essentialism and Teleology Implicit Association Test [IAT]). The development and validation process of these two tests are presented elsewhere. The present article presents the results of the administration of both tests to 332 secondary school students. It was found that: (1) those students exhibited teleology and essentialism conceptions in the context of genetics; the former, but not the latter, were less frequent the older students were; (2) teleology and essentialism conceptions were not correlated; and (3) measures from the explicit and implicit tests were not correlated with each other. Recommendations to improve teaching about genetics are made; for instance, we suggest that students' genetic essentialism conceptions could be addressed by emphasizing the existence of variation within populations and species, and the impact of mutations on phenotypic outcomes. We also recommend that teachers address design teleology and psychological essentialism conceptions independently from each other.

Research in developmental psychology has shown that deeply-rooted, intuitive ways of thinking, such as design teleology and psychological essentialism, impact children's scientific explanations about natural phenomena. Similarly, biology education researchers have found that students often hold inaccurate conceptions about natural phenomena, which often relate to these intuitions. In order to further investigate the relation between students' conceptions and intuitions, we conducted a study with 93 first year undergraduate students in biology. They were asked to express their level of agreement or disagreement with six misconception statements and to explain their choices in a two-tier test. Results showed a tendency for students to agree with teleological and essentialist misconceptions. However, no association was found between students' teleological and essentialist conceptions as expressed in their agreement or disagreement with the various misconception statements. Moreover, we found evidence of a variable consistency across students' answers depending on the misconception considered, which indicates that item features and contexts may have an effect on students' answers. All together, these findings provide evidence for considerable persistence of teleological and essentialist misconceptions among students. We suggest future directions for thinking, studying, and analyzing students' conceptions about biological phenomena.

In this article, we describe the main phases in the development and validation of a questionnaire measuring secondary students' teleology and essentialism conceptions in the context of genetics. The validation process involved 714 Swiss and French secondary school students from 14 different schools. The process included interviews, several pilot studies, experts' feedback, and lasted from January 2017 to May 2018. The final version of the test consists of 20 items based on an ordinal scale, which measure teleology and essentialism conceptions in the context of genetics. Exploratory factor analysis showed a structure with three factors and Cronbach's alpha values indicated a good internal consistency of the items. We also report findings on students' genetic determinism conceptions, even though the respective items were not included in the final questionnaire because their psychometric properties were not as good as those for genetic teleology and genetic essentialism. Implications for science education are discussed.