Abstract

The comparison between natural evolution and the action of a tinkerer has become highly popular since its reintroduction by François Jacob at the end of the 1970s. It has been used as a weapon against the existence of an “intelligent design” as well as a way for synthetic biologists to promote their ambitious projects. I will describe the complex history of this metaphor, and examine its pertinence. Whereas Darwin considered it as a way to describe how evolution proceeded, Jacob linked it with a description of the imperfections of organisms, while Stephen Jay Gould and Richard Lewontin criticized what they called the “Panglossian” vision of most evolutionary biologists. The distinction between the work of engineers and that of tinkerers is not obvious. There are limits to the process of evolution, but their alleged description so far reflects the limits of knowledge on the part of evolutionary biologists more than the existence of true barriers to the evolutionary process. And, in their work, synthetic biologists crucially need the optimizing action of natural selection. To give a definition of synthetic biology is no easy task; the false distinction drawn between the work of synthetic biologists and the action of evolution is of no help