Abstract
A major objective of any scientific endeavor is the discovery of generalizations around which various observations may be organized. In the many physiological disciplines of biology, generalizations have often been sought in the form of a model system, i. e. a physiology determined from studies of one or a few species that is projected as a possible model for other taxa. Two such major generalities are the genetic code and Krebs cycle of respiration. Model systems are of immense value in providing a focus for studies from a diversity of species. However, whenever a model system is based on results from a group of closely related taxa and a new group is then studied, one must be prepared to accept alternative models. Principles are limited by the exceptions to them.
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Crews, D., Bull, J.J. (1987). Evolutionary Insights from Reptilian Sexual Differentiation. In: Haseltine, F.P., McClure, M.E., Goldberg, E.H. (eds) Genetic Markers of Sex Differentiation. Reproductive Biology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1965-6_2
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DOI: https://doi.org/10.1007/978-1-4899-1965-6_2
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