Changes In The Second Edition

The revision and expansion of From DNA to Diversity for this second edition is driven by advances on many fronts. Increased understanding of developmental mechanisms, systematic exploration and comparisons of animal genomes, and inquiries into new models of morphological evolution have provided a wealth of case studies from which we have selected new material. Much of the new coverage in this edition is found in the second part of the book, which has been expanded to five chapters (Chapters 4-8) from four in the first edition. Information and references have been updated throughout the book. Again, we stress that these citations are selective and that neither they nor this book should be taken as the primary or exclusive reference on a topic.

The book's overall organization remains the same, with the first three chapters devoted to the history of animals, developmental genetics, and genetic regulatory mechanisms. The second part of the book (Chapters 4-8) examines the evolution of animals at different morphological levels. The explosion in genome sequence data has provided an enormous increase in the quantity and quality of information concerning the evolution of the genetic toolkit for animal development. Many animal genomes, including our own, have been sequenced since the publication of the first edition. Some of the major insights from genome studies have been added to Chapter 4.

The growth of evolutionary developmental biology has provided new insights into the diversification of specific body plans and the origins of animal novelties. Chapters 5 and 6 have been revised and expanded to incorporate new findings ranging from mechanisms of segmentation in spiders, to the evolution of the cephalopod body plan, and the origin of the turtle shell.

There has also been an increasing focus on models of variation within species and of divergence of traits. Some of the simplest models of phenotypic variation and evolution involve the color patterns of mammals, birds, and insects. In several cases, the identity of genetic differences responsible for variation between populations is now known. We have added a new chapter (Chapter 7) that focuses on models of variation and divergence among closely related species.

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