The simple systems methodology is a powerful reductionistic research strategy. It has problems as implemented in developmental genetics because the organisms studied are few and unrepresentative. Stronger inferences require independent arguments that key traits are widely distributed phylogenetically. Evolutionary and developmental mechanisms of generative entrenchment and self-organization provide possible support, and are also necessary components of a developmental systems approach.

Friedrich Nietzsche''s will to power, and the philosophical ediface built on this foundation, is formulated on a biologicism that is indebted to a particular post-Darwinian vision of the organism. Of the various models that attempt to formulate a comprehensive organismal biology, Nietzsche unknowingly grasped that of Elie Metchnikoff, who authored the theoretical foundation of modern immunology. Metchnikoff regarded the organism as a disharmonious entity, in constant inner strife between competing cellular activities. Immune functions were responsible for mediating harmonization, which however (...) remains an elusive ideal. This view of the organism posited an ever-changing, self-defining entity striving for self-actualization while in ceaseless inner struggle as well as in competition with the environment. The theory is no less than an epistemological response of how to establish the subject-object relation in a construct where the subject''s boundaries are dialectical and evolving. The similarity of the philosophical positions of Nietzsche and Metchnikoff regarding the Self offers rich resonance in current attempts to formulate a biomedical language appropriate to address the issues raised by these problems. (shrink)

Embryonic development and ontogeny occupy whatis often depicted as the black box betweengenes – the genotype – and the features(structures, functions, behaviors) of organisms– the phenotype; the phenotype is not merelya one-to-one readout of the genotype. Thegenes home, context, and locus of operation isthe cell. Initially, in ontogeny, that cell isthe single-celled zygote. As developmentensues, multicellular assemblages of like cells(modules) progressively organized as germlayers, embryonic fields, anlage,condensations, or blastemata, enable genes toplay their roles in development and evolution.As modules, condensations are (...) fundamentaldevelopmental and selectable units ofmorphology (morphogenetic units) that mediateinteractions between genotype and phenotype viaevolutionary developmental mechanisms. In ahierarchy of emergent processes, gene networksand gene cascades (genetic modules) link thegenotype with morphogenetic units such ascondensations, while epigenetic processes suchas embryonic inductions, tissue interactionsand functional integration, link morphogeneticunits to the phenotype. To support theseconclusions I distinguish units of heredityfrom units of transmission and discussepigenetic inheritance by tracing the historyof relationship between embryology andevolution, especially the role(s) assigned tocells or to cellular components in generatingtheories of morphological change in evolution.The concept of cells as modular morphogeneticunits is modeled and illustrated using themammalian dentary bone. (shrink)