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organizational homologyOrganisationshomologie (ger.)

  • Structural identity caused by equal blue-print-related restrictions on development [...] and other morphological organization processes. (HWB)

    If, as here proposed, homology results from organizing processes that integrate and fixate generic and conditionally generated building elements into a stable body plan, then neither genetic nor developmentally based definitions alone can capture the essence of this phenomenon. A more encompassing concept that represents the integration between different levels of organization is needed, one I propose to call the “organizational homology concept.” This concept is based on seven prernises (four established by earlier authors, and three proposed in tbe current chapter):

    1. Homologues are constant elements of organismal construction; they are independent of changes in form and function (Owen, 1843);

    2. Homology signifies identity, not similarity (Owen, 1843);

    3. Homologues are fixated by hierarchically interconnected interdepeodencies (“burden”; Riedl, 1978);

    4. Homologues are developmentally individualized building units (Wagner, 1989a,b);

    5. Homology denotes constancy of constructional organization despite changes in underlying generative mechanisms;

    6. Homologues act as organizers of the phenotype; and

    7. Homologues act as organizers of the evolving molecular and genetic circuitry.

    Müller, G.B. (2003). Homology: the evolution of morphological organization. In: id. & Newman, S.A. (eds.). Origination of Organismal Form, 52-69: 64.