Ecological and evolutionary genetics span many disciplines and virtually all levels of biological investigation, from the genetic information itself to the principles governing the complex organization of living things. The ideas and informa tion generated by ecological and evolutionary genetics provide the substance for strong inferences on the origins, changes and patterns of structural and functional organization in bio logical communi ties. It is the coordination of these ideas and thoughts that will provide the answers to many fundamental questions in biology. There is no doubt that Drosophilids provide strong model systems amenable to experimental manipulation and useful for testing pertinent hypotheses in ecological and evolutionary genetics. The chapters in this volume represent efforts to use Drosophila species for such a purpose. The volume consists of a dedication to William B. Heed, followed by four major sections: Ecological Genetics, Habitat Selection, Biochemical Genetics and Molecular Evolution. Each section is introduced by a short statement, and each chapter has an independent summary. The chapters contain the sub stance of talks given at a joint Australia-US workshop held January 5-10, 1989 at the University of New England, New South Wales, Australia. We are indebted to the Division of International Programs of the National Science Foundation (USA) and to the Science and Technology Collaboration Section of the Department of Industry, Technology and Commerce (Australia) for the provi sion of financial support under the US/Australia Science and Technology Agreement. Many people contributed to the preparation of this volume."

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information. This volume continues bringing to readers the findings of eminent evolutionary biologists and paleobiologists. Among the topics discussed in this book are the origin of the dermal skeleton in conodont chordates, patterns of nucleotide substitution and codon usage in plasmid DNA evolution, a model to explain phenotype stability in functional systems, and inter-island speciation of Hawaiian biota.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information. The current volume includes articles on the conceptual relationship of ontogeny, phylogeny, and classification; correlation studies of spatial patterns of genetic variation; and the evolution of flower display and reward.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information. This latest volume continues the series' focus on critical reviews, commentaries, original papers, and controversies in the field of evolutionary biology.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information. The nature of science is to work on the boundaries between the known and the unknown. These boundaries shift as new methods are developed and as new concepts are elaborated (e.g., the theory of the gene, or more recently, the coalescence framework in population genetics). These tools allow us to address questions that were previously outside the realm of science, and, as a consequence, the boundary between the knowable and unknowable has shifted. A study of limits should reveal and clarify the boundaries and make sharper the set of questions. This book examines and analyzes these new limits as they are applied to evolutionary biology and population genetics. It does this by framing the analysis within four major classes of problems - establishing the fact of evolution; understanding the evolutionary pathways that led to today's biological world; mechanisms of evolutionary change (e.g., models of social behavior, sexual selection, macro evolution); and, finally, prediction.

This volume in the Monographs in Evolutionary Biology series addresses issues that are part of an emerging area of research loosely called "mo lecular evolution. " Its practitioners include both molecular biologists cu rious about the evolutionary implications of their data and evolutionary biologists pushing their analyses to the molecular level. The union of these fields of molecular and organismal biology has been turbulent at times, and, as shall be seen, this dialectic has led to some very serious challenges to long-held notions about the role of natural selection in evolution and the economy of genome organization in eukaryotes. As an inevitable outgrowth of molecular biology, molecular evolution is necessarily a young discipline, but it can already point proudly to two major discoveries. The first, is the molecular clock, a concept that has emerged from the analysis of at least four data sets-amino acid sequences, immunologic data, DNA renaturation studies, and, recently, analyses of DNA sequences. The reality of a strong stochastic component in the evolution of nucleotide sequences can no longer be doubted, although the accuracy of the clock with regard to particular sequences and within particular groups of or ganisms should be independently measured each time it is used. Never theless, molecular clocks will assume increasingly important roles in phy logenetic reconstructions, especially since the fossil record is so fragmentary. The second major discovery of molecular evolution has been the incredible complexity of the eukaryotic genome."

This volume is the twenty-ninth in this series, which includes twenty-eight numbered volumes and one unnumbered supplement. The editors continue to focus on critical reviews, commentaries, original papers, and controversies in of the reviews range from anthropology to evolutionary biology. The topics molecular evolution, population biology to paleobiology. Recent volumes have included a broad spectrum of chapters on such subjects as population biology, comparative morphology, paleobiology, molecular phy logenetics, developmental evolutionary biology, systematics, and the history of evolutionary biology. The editors continue to solicit manuscripts in all areas of evolutionary biology. Manuscripts should be sent to anyone of the following: Max K. Hecht, Department of Biology, Queens College of the City University of New York, Flushing, New York 11367; Ross 1. MacIntyre, Department of Genetics and Development, Cornell University, Ithaca, New York 14853; or Michael T. Clegg, Department of Botany and Plant Sciences, University of California, Riverside, California 92521. vii Contents 1. Homology and Embryonic Development Brian K. Hall Introduction .............................................. 1 A Brief History of the Concept of Homology ................. 1 von Baer's Laws ........................................ 4 Germ Layers and Ernst Haeckel ............................ 6 Embryology and Homology ............................... 7 Homology: An Unsolved Problem ............................ 8 Latent Homology ........................................ 8 Serial Homology ........................................ 9 Common Origins and Common Inductions ..................... 12 Mechanisms of Gastrulation ............................... 13 Origin of the Alimentary Canal ............................ 14 Origin of Germ Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 . . . . . . . . . . Induction of Meckel's Cartilage ............................ 15 Induction of the Lens of the Eye ........................... 16 Development of Internal and External Cheek Pouches .......... 18 Selection for Increased Tail Length in Mice .................. 19 Regeneration and Homology .... . . . . . . . . . . . . . . . . . . . . 20 . . . . . . ."

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information.

This volume is the 33rd in this series, which includes 32 numbered volumes and an unnumbered supplement. Several special volumes have also been published as separate monographs. This volume, like the others in the series, has chapters devoted to a broad spectrum of topics. Indeed, the editors continue to solicit manuscripts on subjects covered by the encompassing rubric of Evolutionary Biology.

"Volume 33 continues the grand tradition of Evolutionary Biology in being the most comprehensive series in the field. The chapters are always up-to-date, informative, and stimulating; sometimes infuriating. Just what good scientific literature should be Particularly attractive is the free-wheeling spirit of the series: no style or length is imposed. If you want to remain cognizant of contemporary evolutionary advances in general and have time to read only one volume a year outside your own specialty, make it Evolutionary Biology."
(Jeffrey R. Powell, Ph.D., Yale University)

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information.

This volume is the 33rd in this series, which includes 32 numbered volumes and an unnumbered supplement. Several special volumes have also been published as separate monographs. This volume, like the others in the series, has chapters devoted to a broad spectrum of topics. Indeed, the editors continue to solicit manuscripts on subjects covered by the encompassing rubric of Evolutionary Biology.

"Volume 33 continues the grand tradition of Evolutionary Biology in being the most comprehensive series in the field. The chapters are always up-to-date, informative, and stimulating; sometimes infuriating. Just what good scientific literature should be Particularly attractive is the free-wheeling spirit of the series: no style or length is imposed. If you want to remain cognizant of contemporary evolutionary advances in general and have time to read only one volume a year outside your own specialty, make it Evolutionary Biology."
(Jeffrey R. Powell, Ph.D., Yale University)

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information.

The nature of science is to work on the boundaries between the known and the unknown. These boundaries shift as new methods are developed and as new concepts are elaborated (e.g., the theory of the gene, or more recently, the coalescence framework in population genetics). These tools allow us to address questions that were previously outside the realm of science, and, as a consequence, the boundary between the knowable and unknowable has shifted. A study of limits should reveal and clarify the boundaries and make sharper the set of questions. This book examines and analyzes these new limits as they are applied to evolutionary biology and population genetics. It does this by framing the analysis within four major classes of problems - establishing the fact of evolution; understanding the evolutionary pathways that led to today's biological world; mechanisms of evolutionary change (e.g., models of social behavior, sexual selection, macro evolution); and, finally, prediction.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information.

This volume continues bringing to readers the findings of eminent evolutionary biologists and paleobiologists. Among the topics discussed in this book are the origin of the dermal skeleton in conodont chordates, patterns of nucleotide substitution and codon usage in plasmid DNA evolution, a model to explain phenotype stability in functional systems, and inter-island speciation of Hawaiian biota.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information.

Volume 30 brings readers up to date on the investigation of eminent evolutionary biologists and paleobiologists. Contributions explore such topics as

• Adaptation in Drosophila and the role of cytochrome P450s
• Population genetics and species conservation of the cheetah
• germ-layer theory
• assymetry in the mammalian skeleton
• genetic diversity of marine fish
• the phenomenon of industrial melanism
• the variation in lizard cranal kinesis.

Other chapters focus on such issues as overdominance and its relation to higher mutation-rate estimates and the use of molecular clocks in determining the rate of nucleotide substitution in higher plants.

After volume 33, this book series was replaced by the journal "Evolutionary Biology." Please visit www.springer.com/11692 for further information. In Volume 29, internationally acclaimed researchers address a broadrange of topics including the organization of eukaryotic genes, evolution of Drosophila mating systems, and evolutionary-developmental approaches to fin/limb transformation.

Evolutionary Biology celebrates its Quarter-Century Anniversary! 'Evolutionary Biology occupies a unique and valuable place in the evolutionary literature...The editors are to be congratulated on their continuing ability to attract interesting articles.' --- The Journal of Evolutionary Biology

Presents detailed discussions on the systematic, ecological, and evolutionary implications of the pollination of terrestrial orchids of Southern Australia and the Mediterranean; variation and diversity in deep-sea echinoids; the molecular evolution of the alcohol dehydrogenase genes in Drosophila;

This latest volume continues the series' focus on critical reviews, commentaries, original papers, and controversies in the field of evolutionary biology.