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One of the major questions in the evolution of animals is the transition from unicellular to multicellular organization, which resulted in the emergence of Metazoa through a hypothetical Urmetazoa. The Comparative Embryology of Sponges contains abundant original and literary data on comparative embryology and morphology of the Porifera (Sponges), a group of 'lower Metazoa'. On the basis of this material, original typization of the development of Sponges is given and the problems concerning origin and evolution of Porifera and their ontogenesis are discussed. A morphogenetic interpretation of the body plan development during embryogenesis, metamorphosis and asexual reproduction in Sponges is ...
Current Topics in Developmental Biology
Current Topics in Developmental Biology, Volume 45 surveys the major issues at the forefront of developmental biology. This volume, like others in the serial, is valuable to researchers in the fields of animal and plant development, and to students and other professionals who want an introduction to current topics in cellular and molecular approaches to developmental biology. Chapters on the nervous system, reproductive system, and flowering introduce new models and concepts for understanding these processes. Key Features * Includes development of the nervous and reproductive systems * Covers flowering in plants * Highlights the roles of homeobox-related transcription factors and growth factors in axis and organ development.
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Acoelomate and Pseudocoelomate Metazoans
Reproduction of Marine Invertebrates, Volume I: Acoelomate and Pseudocoelomate Metazoans is a collection of papers that deals with the evolution of reproductive mechanisms and behavior in marine invertebrates. This collection starts with terminologies and basic events in marine invertebrate reproduction, including the method of estimating sexual reproductive activity, as well as the timing and patterns involved. The book notes that temperatures, salinities, or food availability should be favorable when the young are produced and when they are developing. One paper shows that the reproductive rhythm is dynamic and in some species is latitude-dependent. Other papers discuss the reproductive cy...
From Egg to Embryo
The last ten years have shown a dramatic revolution in our understanding of early animal development. This new edition of the successful first edition describes the result of this revolution and explains how the body plan of an embryo emerges from the newly fertilised egg. The book starts with a critical discussion of embryological concepts and explains in simple terms the mathematics of cell states, morphogen gradients and threshold responses. The experimental evidence on the mechanism of regional specification in Xenopus, molluscs, annelids, ascidians as well as Caenorhabditis, the mouse, the chick and Drosophila is then discussed. The whole chapter devoted to the exciting developments in Drosophila provides a clear guide to the subject, including a new table outlining the developmentally important genes. The emphasis throughout is on conceptual clarity and unity: bringing together the mathematical models, embryological experiments and molecular biology into a single, comprehensive coherent account.
Determinants of Spatial Organization
Determinants of Spatial Organization documents the proceedings of the 35th symposium of the Society for Developmental Biology in 1978. The symposium brings together a diverse group of investigators who are engaged in the analysis of mechanisms involved in spatial organization. The contributions made by researchers at the symposium are organized into three parts. Part I on the cytoplasmic localization of determinants includes studies on fine structure of cytoplasmic specializations of the polar lobe of molluscan embryos; the fine structure of the polar granules of Drosophila eggs; and the polarity of rhizoid formation in Fucus. Part II deals with maternal-effect mutants of developmental proce...
Evolution and Development
The marriage of evolutionary biology with developmental biology has resulted in the formation of a new field, evolutionary developmental biology, or "evo-devo. This volume reviews current research findings and thought in the broad field of evo-devo, looking at the developmental genetic mechanisms that cause variation and how alterations of these mechanisms can generate novel structural changes in a variety of plant and animal life. - Reviews current research findings and thought on evolutionary developmental biology, providing researchers an overview and synthesis of the latest research findings and contemporary thought in the area - Includes chapters discussing the evolutionary development of a wide variety of organisms and allows researchers to compare and contrast how genes are expressed in a variety of organisms—from fly to frog, to humans - Emphasizes the role of regulatory DNA in evolutionary development to give researchers perspective on how the regions of the genome that control gene expression and the protein factors that bind them are ultimately responsible for the diversity of life that has evolved
