Scientific activities take place within the structured sets of ideas and assumptions that define a field and its practices. The conceptual framework of evolutionary biology emerged with the Modern Synthesis in the early twentieth century and has since expanded into a highly successful research program to explore the processes of diversification and adaptation. Nonetheless, the ability of that framework satisfactorily to accommodate the rapid advances in developmental biology, genomics and ecology has been questioned. We review some of these arguments, focusing on literatures (evo-devo, developmental plasticity, inclusive inheritance and niche construction) whose implications for evolution can be interpreted in two ways—one that preserves the internal structure of contemporary evolutionary theory and one that points towards an alternative conceptual framework. The latter, which we label the ‘extended evolutionary synthesis' (EES), retains the fundaments of evolutionary theory, but differs in its emphasis on the role of constructive processes in development and evolution, and reciprocal portrayals of causation. In the EES, developmental processes, operating through developmental bias, inclusive inheritance and niche construction, share responsibility for the direction and rate of evolution, the origin of character variation and organism–environment complementarity. We spell out the structure, core assumptions and novel predictions of the EES, and show how it can be deployed to stimulate and advance research in those fields that study or use evolutionary biology.
|Scooped by Junaid Akhtar|
Junaid Akhtar's insight:
Within evolutionary biology, development has been traditionally viewed as under the direction of a genetic program. While the terminology of contemporary biologists is typically more nuanced, Moczek  shows that genetic ‘blueprint’, ‘program’ or ‘instructions' metaphors remain widespread in evolutionary biology texts. By contrast, the EES regards the genome as a sub-system of the cell designed by evolution to sense and respond to the signals that impinge on it . Organisms are not built from genetic ‘instructions’ alone, but rather self-assemble using a broad variety of inter-dependent resources. Even where there is a history of selection for plasticity, the constructive development perspective entails that prior selection underdetermines the phenotypic response to the environment.