For those topics deemed most likely in need of reviewing, a series of summary diagrams is provided in the appendix. The foregoing description applies to the first seven chapters of the book. The selection of examples throughout the text was driven by two principles. The second guiding principle is that the organization of this book follows the logic of concepts, rather than that of case studies. Examples, therefore, were chosen to illustrate specific methods or principles under discussion, and for this reason certain genes or genetic diseases may appear in various places in the book.
Illustrations are, to a large extent, taken from or based on the original literature.
In these cases figures are visual pedagogical devices, and are used to present data that support contentions made in the text.