Geographic Variation, Speciation and Clines explores the origins and development of geographic variation, divergence, and speciation. In particular it is concerned with genetic divergence as it is usually found on continents, among groups of populations isolated only by distance. Although earlier writers on this topic considered the effects of geography and dispersal, intense geographic differentiation and speciation were thought to require complete isolation. Professor Endler shows how geographic differentiation and speciation may develop in spite of continuous gene flow. Following a review of the diverse and scattered literature on gene flow and population differentiation, the author discusses the relationships among gene flow, dispersal, and migration. He then summarizes the factors which limit the geographic extent of gene flow, and those which allow steep clines to develop in the absence of barriers to gene flow. His analysis draws on examples from the field, experiments, and single- and multiple-locus models. The mechanism and conditions for parapatric speciation are presented: steepening clines, development into hybrid zones, and the evolution of sexual isolation. In the final chapter the author considers the interpretation of natural clines and the associated geographic patterns of subspecies and species.
Self-study in teacher education is a growing field and a natural progression from the concept of reflective practice for pre-service teachers. This book is designed to introduce teacher educators to the theory and practice of self-study, in order to explore, understand and improve their teaching about teaching. With studies from an international range of contributors, this book illustrates a variety of approaches to self-study. It describes the issues that teacher educators have chosen to study, how they carried out their research and what the learning outcomes were. Throughout, the emphasis is on placing teacher educators' knowledge and practice at the centre of their academic work. This book will be of interest to all teacher educators wishing to improve their knowledge and practice.
Shortlisted for the Templeton Foundation Prize for Outstanding Books in Theology and Natural Sciences John Brooke and Geoffrey Cantor discuss exciting developments in the sciences, whether in Big Bang cosmology, chaos theory or genetic engineering, in relation to moral and spiritual questions. Contemporary discussion can, however, be blind if it ignores previous forms of engagement between science and religion. In their Gifford Lectures the authors argue that not one but several historical approaches are required to achieve critical perspective and balanced understanding. Accordingly, each chapter demonstrates the value of a particular historical method. Ranging from alchemy to new-age philosophies, from the Galileo affair to the Darwinian controversies, this is an indispensable and highly accessible book for all interested in science and religion.
John Tyler Bonner, a major participant in the development of biology as an experimental science, is the author not only of important monographs but also of a wonderfully readable book, Life Cycles, which is both a personal memoir and a profound commentary on the central themes of biology. This volume of essays presents new material that extends the concepts from Life Cycles and his other writings. Its originality lies in comparing key basic biological processes at different levels, from molecular interactions through multicellular development to behavior and social interactions. The first chapter in the book discusses self-organization and natural selection; the second, competition and natural selection; and the third, gene accumulation and gene silencing. The fourth chapter examines the division of labor in organisms at all levels: within the organelles of a cell, within groups of cells in the guise of differentiation, within groups of individuals in an animal society, and within our culturally determined human societies. The work closes with a charming personal history of sixty years of changes in the field of biology, including the transformation in the ways that research work is funded. Originally published in 1996. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
A century ago Darwin and Wallace explained how evolution could have happened in terms of processes known to take place today. This book describes how their theory has been confirmed, but at the same time "transformed", by recent research.
This is a review of the whole family of waders. This seminal title remains the definitive book on waders – known in the US as shorebirds. Included is everything you need to know about these masters of shore and wetland.
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