Pablo Lorenzano

Taking as starting point Kuhn’s analysis of science textbooks and its application to Sinnott and Dunn’s (1925), it will be discussed the problem of the existence of laws in biology. In particular, it will be showed, in accordance with the proposals of Darden (1991) and Schaffner (1980, 1986, 1993), the relevance of the exemplars, diagrammatically or graphically represented, in the way in which is carried out the teaching and learning process of classical genetics, inasmuch as the information contained in them, indispensable for the right development of that process, exceeds the information contained in the “laws” linguistically articulated and presented in the textbooks. However, it will be maintained that the information is implicit in the law that according to the structuralist concept of fundamental law and the reconstruction of genetics presented by Balzer & Dawe (1990), and later developed by Balzer & Lorenzano (1997) and Lorenzano (1995, 2000, 2002a) could be considered the fundamental law of classical genetics,the law of matching, clearly identified in this paper.

The epistemic status of Natural Selection has seemed intriguing to biologists and philosophers since the very beginning of the theory to our present times. One prominent contemporary example is Elliott Sober, who claims that NS, and some other theories in biology, and maybe in economics, are peculiar in including explanatory models/conditionals that are a priori in a sense in which explanatory models/conditionals in Classical Mechanics and most other standard theories are not. Sober’s argument focuses on some “would promote” sentences that according to him, play a central role in NS explanations and are both causal and a priori. Lange and Rosenberg criticize Sober arguing that, though there may be some unspecific a priori causal claims, there are not a priori causal claims that specify particular causal factors. Although we basically agree with Lange and Rosenberg’s criticism, we think it remains silent about a second important element in Sober’s dialectics, namely his claim that, contrary to what happens in mechanics, in NS explanatory conditionals are a priori, and that this is so in quite specific explanatory models. In this paper we criticize this second element of Sober’s argument by analyzing what we take to be the four possible interpretations of Sober’s claim, and argue that, terminological preferences aside, the possible senses in which explanatory models in NS can qualify, or include elements that can qualify, as a priori, also apply to CM and other standard, highly unified theories. We conclude that this second claim is unsound, or at least that more needs to be said in order to sustain that NS explanatory models are a priori in a sense in which CM models are not

Scientific activity produces results of various types. In particular, science produces a special kind of knowledge or knowledges, assumed to be different from knowledge or common sense knowledge, from everyday experience and formulated in ordinary language; a more systematized knowledge, with greater range and accuracy, and intersubjectively controllable. To produce this kind of knowledge (or knowledge), we introduce new concepts, formulate hypotheses and laws and, ultimately, construct theories, being the result of a practice or specific activity, considering science as (perhaps), the supreme intellectual achievement of mankind. Thus, philosophical theorizing of science, or “philosophy of science”, is characterized by the development of interpretative conceptual frameworks of philosophical character, in order to understand science. Philosophy of science is, not just part of metascience, but also a part of philosophy, precisely that which is responsible for analyzing science.

The present paper is framed within one of the predominant currents of contemporary philosophy of science, which is based in case studies, in order to construct a solid, non-speculative, metatheory. In this paper classical genetics is formally analized and reconstructed with the instruments, duly modified and extended in accordance with the considered case, of the structuralist view of theories, in such a way that that theory can be characterized as a refinement of an earlier introduced model of genetics, which determines the fundamental traits of any genetical model. Finally, from the reconstruction of classical genetics, the so-called “mendelism” is formally characterized trying to do justice, and to precise, some recent results in the historiography of genetics.

The aim of this article is to discuss and develop the diagnose of the Hardy-Weinberg law made by van Fraassen (1987, p. 110), according to which: 1) that law cannot be considered a law used as an axiom for the classical population genetics as a whole, since it is an equilibrium-law that holds only under certain special conditions; 2) it just determines a subclass of models; 3) its generalization shades off into logical vacuity; and 4) more complex variants of the law can be deduced for more realistic assumptions. The discussion and development of such a diagnose will be carried out with the notions of another semantic conceptions of theories, related to that of van Fraassen, namely, the structuralist view of theories, and a rational reconstruction of classical population genetics made within the framework of such a metatheory, also presented in this paper.

In two occasions a Bibliography of Structuralism has been published in Erkenntnis (1989, 1994). Since then a lot of water has flowed under the bridge and the structuralist program has shown a continuous development. The aim of the present bibliography is to celebrate the 25th anniversary of the publication of An Architectonic for Science –structuralism’s main reference work– and of its recent translation into Spanish by updating the previous bibliographies with titles which have appeared since 1994 as well as before that year but which are not included in them. As in the former deliveries, this bibliography only covers books and articles that are concerned directly with the structuralist approach in the philosophy of science. We would like to thank the many colleagues who have helped us in collecting all the information. Notwithstanding we apologize in advance for the possible entries that we missed to include in this third Bibliography of Structuralism.

The aim of this paper is to further develop van Fraassen’s diagnosis, expanding a previous analysis of the fundamental law of classical genetics and the status of the so-called ‘Mendel’s laws’.6 According to this diagnosis the Hardy-Weinberg law: 1) cannot be considered as axiom (or fundamental law) for classical population genetics, since it is a law that describes an equilibrium that 2) holds only under certain special conditions, and 3) only determines a subclass of models, 4) whose generalized form (and fundamental law) being shading off into logical vacuity, and 5) more complex variants of the fundamental law (and of the Hardy-Weinberg law) can be “deduced” for more realistic assumptions. In order to achieve this, I will use notions of the structuralist view of theories, a version that is related to but different from that of van Fraassen’s. These are the notions of fundamental law, specialization, and special law. Having as a background a structuralist reconstruction of classical population genetics, I will show why the Hardy-Weinberg law should not be in fact considered the fundamental law of such a theory, but a special law (and not even a “terminal” specialization, i.e. a “non-terminal” specialization).

This paper consists of three sections. In the first one, some of the main developments in the philosophy of science through the xx century up to the present will be pointed out, and inserted them in the frame of some more general philosophical transformations, such as the so-called “linguistic turn” and “pragmatic turn”, respectively. In the second one, the established connection will be nuanced, from a revision of the work of a “classical” author such as Carnap. Finally, it will be intended a kind of “balance and future perspectives”.

Taking as starting point Kuhn’s analysis of science textbooks and its application to Sinnott and Dunn’s (1925), it will be discussed the problem of the existence of laws in biology. In particular, it will be showed, in accordance with the proposals of Darden (1991) and Schaffner (1980, 1986, 1993), the relevance of the exemplars, diagrammatically or graphically represented, in the way in which is carried out the teaching and learning process of classical genetics, inasmuch as the information contained in them, indispensable for the right development of that process, exceeds the information contained in the “laws” linguistically articulated and presented in the textbooks. However, it will be maintained that the information is implicit in the law that according to the structuralist concept of fundamental law and the reconstruction of genetics presented by Balzer & Dawe (1990), and later developed by Balzer & Lorenzano (1997) and Lorenzano (1995, 2000, 2002a) could be considered the fundamental law of classical genetics,the law of matching, clearly identified in this paper.

The purpose of this paper is to defend, contra Fodor and Piattelli-Palmarini (F&PP), that the theory of natural selection (NS) is a perfectly bona fide empirical unified explanatory theory. F&PP claim there is nothing non-truistic, counterfactual-supporting, of an “adaptive” character and common to different explanations of trait evolution. In his debate with Fodor, and in other works, Sober defends NS but claims that, compared with classical mechanics (CM) and other standard theories, NS is peculiar in that its explanatory models are a priori (a trait shared with few other theories). We argue that NS provides perfectly bona fide adaptive explanations of phenotype evolution, unified by a common natural-selection guiding principle. First, we introduce the debate and reply to F&PP’s main argument against NS. Then, by reviewing different examples and analyzing Fisher’s model in detail, we show that NS explanations of phenotypic evolution share a General Natural Selection Principle. Third, by elaborating an analogy with CM, we argue against F&PP’s claim that such a principle would be a mere truism and thus explanatorily useless, and against Sober’s thesis that NS models/explanations have a priori components that are not present in CM and other common empirical theories. Irrespective of differences in other respects, the NS guiding principle has the same epistemic status as other guiding principles in other highly unified theories such as CM. We argue that only by pointing to the guiding principle-driven nature that it shares with CM and other highly unified theories, something no-one has done yet in this debate, one can definitively show that NS is not defective in F&PP’s sense: in the respects relevant to the debate, Natural Selection is as defective and as epistemically peculiar as Classical Mechanics and other never questioned theories

The aim of the present communication is to contribute to the discussion about the existence of laws in biology. In order of it the argumentation of J.J.C. Smart against their existence and the discussion of it made by M. Ruse and R. Munson are first reconstructed. The examination of this controversy shows that, despite of the differences between the first of the authors mentioned and the other two in relation to the problem of laws in biology, the three share the assumption according to which in the case that there are laws (in strict sense or fundamental) in genetics, they must be some of the so-called “Mendel’s laws”. In the present communication, and from a revision of the metascientific concept of fundamental law, the above assumption is questioned, proposing an alternative analysis, based on a structuralist reconstruction of genetics.

En esta trabajo se analiza la relación existente entre las propuestas de Mendel, de los "redescubridores" -de Vries, Correns y Tschermak-, de Bateson y colaboradores y de Morgan y discípulos, e.e. la historia de la genética "clásica", en términos de "inconmensurabilidad", de forma tal de capturar y precisar tanto la idea de que entre éstas se dan ciertas discontinuidades y rupturas como de que éstas tienen "algo" que ver de algún modo entre sí. En particular, se introducen, con ayuda del marco conceptual de la metateoría estructuralista, y aplican al presente caso, los conceptos de "inconmensurabilidad teórica" y "comparabilidad empírica". In this paper the existing relationship between the proposals of Mendel, the "rediscoverers" -de Vries, Correns and Tschermak-, Bateson and collaborators and Morgan and disciples, e.g. the history of "classical" genetics is analyzed in terms of "incommensurability", in such a way to capture and to precise so much the idea that among them take place some discontinuities and ruptures as well as that they have "something" to do with each other. In particular, the concepts of "theoretical incommensurability" and "empirical comparability" are introduced with the help of the conceptual framework of the structuralist view of theories and applied to this case

In this comment on the work by Ulises Moulines I shall not refer to the interesting analysis of the ontological commitments that depends the treatment of the so-called «data models», nor shall I debate the general metaphysical principles proposed in his approach, adopting an experimentalist, instrumentalist, anti-realistic, positivist or empirical stance. I shall focus on the last part of his article in which he elaborates on the links between Wesley Salmon’s causalist approach and the structuralist analysis of explanation viewed as theoretical subsumption, as he relates it to the structural analysis of the theoretical terms in light of a certain general shared understanding of the job of epistemology.

We present a reconstruction of so-called classical, formal or Mendelian genetics using a notation which we believe is more legible than that of earlier accounts, and lends itself easily to computer implementation, for instance in PROLOG. By drawing from, and emending, earlier work of Balzer and Dawe (1986,1997), the present account presents the three most important lines of development of classical genetics: the so-called Mendel's laws, linkage genetics and gene mapping, in the form of a theory-net. This shows that the set theoretic representation format used in the structuralist approach to the philosophy of science also applies to the domain of genetic theories. There construction is intended to lend more clarity to theme thodological, philosophical and didactical discussions of the foundations of genetics, and on the other hand to defend a formally, logically minded view of theories which seems to have become contested through the work of Feyerabend, Kuhn and Kitcher

The question posed by the title is usually answered by saying that the “synthesis” between the theory of evolution by natural selection and classical genetics, which took place in 1930s-40s, would have taken place much earlier if Darwin had been aware of Mendel and his work. What is more, it nearly happened: it would have been enough if Darwin had cut the pages of the offprint of Mendel’s work that was in his library and read them! Or, if Mendel had come across Darwin in London or paid him a visit at his house in the outskirts! (on occasion of Mendel’s trip in 1862 to that city). The aim of the present paper is to provide elements for quite a different answer, based on further historical evidence, especially on Mendel’s works, some of which mention Darwins’s studies.