Abstract
Despite the undeniable epistemic progress of developmental biology from the second half of the twentieth century to the present day, there still is widespread disagreement on defining the biological term of ‘development’. This scientific field epistemologically is neither unsuccessful nor immature, thus the persistent lack of agreement on its most central concept raises some important questions: is there any need for an explicit definition of biological development, and if so, what content should the definition have? My central thesis is twofold. First, that current definitions of biological development are conceptually or empirically inadequate. Second, that an explicit definition of biological development is very much needed (a) for the practical purposes of science textbooks, but more importantly is needed (b) epistemically for exposing or overcoming problematic assumptions and for partially guiding scientific research by coding the appropriate assumptions. To support this thesis, initially I will show the deficiencies of the dominant definitions of biological development; and subsequently I will provide two arguments: an Argument from Practical Purposes and an Argument from Epistemic Purposes. Finally, for accommodating practical and epistemic purposes and as a response to the inadequacy of the available definitions of development, I will propose and defend an operational definition of biological development which is aimed to be broader than the received ones, while being more precise and fruitful to conduct empirical research.
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Notes
For example, see the work of Oppenheimer (1966).
E.g.: Turing’s reaction–diffusion model for biological pattern formation (Turing 1952); the first successful nuclear transplantation in frogs, namely the first cloning experiment (Briggs and King 1952); discovery of the potential reversibility of cell specification and cloning frogs (Gurdon 1958, 1962); a mechanism for pattern formation based on the concept of “positional information” (Wolpert 1969); discovery of gene regulatory networks (GRNs) for development (Britten and Davidson 1969; Davidson 1986); the first IVF baby was born (Steptoe and Edwards 1978); discovery of homeobox genes that regulate morphogenesis (Garber et al. 1983; Scott et al. 1983); the first cloned mammal: a sheep named ‘Dolly’ (Wilmut et al. 1997; Maienschein 2014).
'[A]n antithesis which Aristotle was the first to perceive, and the subsequent history of which is almost synonymous with the history of embryology’ (Needham 1959: 40).
Resembling somewhat the function of what came to be known later as Spemann’s organizer.
Aristotle thought that in blooded animals, for example in humans, the foetation is definitely constituted only when the heart has formed (735a), in that stage he believed that the foetus is already a potentially ‘imperfect animal’ (i.e. nonlocomotive animal) (740a24)), because it necessarily needs nourishment from an external source—i.e. from the uterus of its mother (like a plant makes use of the soil)– until such time as it is sufficiently perfected to be a potentially locomotive animal (740a24-27).
Development is “how a single fertilized egg cell goes through the complex and beautifully orchestrated series of changes that create an entire organism” (Barinaga 1994).
As Minelli (2021: 26) correctly points out: “It is difficult to deny that the adultocentric vision [of development] contains a good deal of finalism. From this point of view, a comparison between developmental biology and evolutionary biology can be interesting. In the latter, finalism survives only in rather superficial popular versions of the theory, in which evolution is considered synonymous with progress, rather than a continuous and always imperfect adjustment to the changing conditions faced by a population. In developmental biology, however, sentences with a finalistic flavour often come from the pen of authoritative scientists. For example, Eric Davidson, a scholar to whom we owe major achievements in the molecular genetics of development, wrote that ‘development is the execution of the genetic programme for the construction of a given species of organism’ […].”.
Besides its vague thinness, this definition “Development is the route by which an organism goes from genotype to phenotype” (Gilbert and Barresi 2019) is misleading regarding the relation between genome and phenotype, for the following reasons: First, it gives the wrong impression that the relation between genome and phenotype can exist in vacuum (without any environmental input/context) for it does not mention the dimension/component of environment; and second it misrepresents this relation as unidirectional –a directed path from the genome to the phenotype– where in biological reality the causal influence can run both ways due the influence that phenotype can exert on certain environmental parameters which on turn can have a non-negligible impact on the genotype (Brandon 1990; Lewontin 2000). In other words, Gilbert’s most recent definition of biological development (Gilbert and Barresi 2019) fails because it is committed to some global/extreme version of genetic determinism which is outdated (patently false).
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Silvestros, P. An operational definition of biological development. Biol Philos 38, 44 (2023). https://doi.org/10.1007/s10539-023-09932-y
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DOI: https://doi.org/10.1007/s10539-023-09932-y