Download or read book The Theory of Inbreeding written by Sir Ronald Aylmer Fisher and published by . This book was released on 1965 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Segregating inbreed lines; Progress towards homozygosity; Various systems of inbreeding; Junctions; Appendix.

Download or read book The Natural History of Inbreeding and Outbreeding written by Nancy Wilmsen Thornhill and published by University of Chicago Press. This book was released on 1993-08-15 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inbreeding, the mating of close kin, and outbreeding, the mating of distant relatives or unrelated organisms, have long been important subjects to evolutionary biologists. Inbreeding reduces genetic diversity in a population, increasing the likelihood that genetic defects will become widespread and deprive a population of the diversity it may need to cope with its environment. Most plants and animals have evolved behavioral and morphological mechanisms to avoid inbreeding. However, today many endangered species exist only in small, very isolated populations where inbreeding is unavoidable, so it has become a concern for conservationists. In this volume, twenty-six experts in evolution, behavior, and genetics examine the causes and consequences of inbreeding. The authors ask whether inbreeding is as problematic as biologists have thought, under what ecological conditions inbreeding occurs, and whether organisms that inbreed have mechanisms to dampen the anticipated problems of reduced genetic variation. The studies, including theoretical and empirical work on wild and captive populations, demonstrate that many plants and animals inbreed to a greater extent than biologists have thought, with variable effects on individual fitness. Graduate students and researchers in evolutionary biology, animal behavior, ecology, and conservation biology will welcome this wide-ranging collection.

Download or read book The Theory of Inbreeding written by Ronald Aylmer Fisher (Genetician, Statistician, Great Britain) and published by . This book was released on 1965 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Incest and Inbreeding Avoidance written by Gregory C. Leavitt and published by . This book was released on 2005 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines Darwinian social science through the substantive topic of incest and inbreeding avoidance, a behavior forward by human sociobiology as the best example of sociocultural behavior naturally selected in humans. I first encountered Gregory Leavitt's work while I was myself researching incest avoidance and the incest taboo. Like many anthropologists with limited expertise in genetics, I had assumed that inbreeding was securely established as a source of genetic depression. To be sure, anthropologists have commonly identified other factors as also having causative influences on incest avoidance and taboos, but I had presumed that the deleterious consequences of inbreeding had to be one - if not the ultimate - causative factor in a full accounting of the phenomenon. At around this time, though, Leavitt published in the American Anthropologist a cogent challenge to the conventional wisdom, and it seemed to throw everything back up into the air. Accordingly, in my own writings, it seemed best to side-step the issue, pending further research by those qualified to conduct it. examination of the inbreeding theory. From lacunae in the special and general theory of evolution, through the ethological evidence commonly used to support the existence of inbreeding avoidance in sexual species, to the oft-cited kibbutzim data, he mounts what is surely the most comprehensive critique that has ever been addressed to a theory of incest. Marshaling a range of disparate, sometimes neglected sources scattered through several disciplines, he trains an impressive level of fire on what many have accepted as the standard explanation for the incest taboo. Leavitt's treatment of the inbreeding and incest issue is neatly folded into a second, more encompassing focus: a rigorous critique of sociobiology. Beginning with E. O. Wilson, sociobiologists have commonly claimed the genetic depression explanation for incest avoidance as one of the jewels - if not the canonical gem - in the sociobiological crown. Leavitt uses his critique of the inbreeding argument as a point of departure for exploring broader inadequacies and weaknesses in sociobiology. In a theoretical field that prides itself for its scientific approach to social behavior, Leavitt finds a disturbing level of 'unscientific' sloppiness and an unsettling absence of 'scientific' skepticism. Although not all Darwinian theorists of social behavior deserve to be tarred with the same brush, Leavitt uncovers more than enough cause for dismay. To begin with, he finds that parts of the evidence used to support the inbreeding hypothesis do not warrant the weight placed on it; other aspects have been tendentiously (and sometimes incorrectly) interpreted; and yet other elements can be accounted for with more parsimonious explanations. Furthermore, although the cornerstone of sociobiological theorizing is the idea that genes or gene complexes generate complex, flexible behaviors, Leavitt points out that there is as yet no unequivocal evidence to support this proposition. of unequivocal evidence for the existence of energy strings and multiple dimensions invalidate string theory. The difference is that string theorists explicitly designate strings and multiple dimensions as hypothetical; they regard their existence skeptically; and they make constant efforts to test these basic propositions by deducing empirical consequences, by analyzing them for theoretical inconsistencies, and by examining how they conform with other, better substantiated theory. By contrast, Leavitt argues, sociobiology routinely hypothesizes the existence of full-blown, generative gene complexes behind incest avoidance, cannibalism, sacrifice, war, and other complex behaviors, yet it rarely tries to demonstrate or test the hypothesis. Too little consideration is given even to detailing possible intermediate steps through which such complexes might have evolved over time. A plausible explanation of how and why an inbreeding species might make the transition to outbreeding practice, for example, would go a long way to shoring up the inbreeding theory and might open up ways of testing it. exercise is far from easy, but the difficulties can hardly be more thorny than those encountered by string theorists. Leavitt even musters a critique of Darwinian theory, a risky exercise given the difficulties of mastering such a specialized and sprawling field and the defensiveness that biologists no doubt feel in the face of the ill-informed attacks and sometimes deceptive tactics of creationists and proponents of intelligent design. Some of the critics he cites - Gould, Lewontin, and most especially Behe - have provoked controversy, and only evolutionists can judge the ultimate value of Leavitt's critique. For a social science audience, though, these chapters are useful reminders that evolutionary theory has yet to be nailed down in all of its particulars, and they are valuable summaries of the issues that are and are not still in dispute. The real value of this book, though, lies in what it is not and in what it offers to sociobiology as well as to its critics. There can be no doubt where Leavitt stands on the issues, but what makes this book so exceptional is the absence of shrillness and polemic. racism with which sociobiologists are usually tarred. Nor is there resort to the tired claim that sociobiologists are uncritically externalizing western cultural assumptions (in contrast to the critics who make this charge, from whose eyes the cultural scales supposedly have fallen). Instead, Leavitt has done what is too rarely ventured, both within and beyond sociobiology. Rather than lobbing polemics, he has endeavored to engage sociobiology on its own terrain, to apply the critical eye that one wishes sociobiologists themselves had more rigorously applied. He mounts a strong and exhaustive case for the prosecution in a hearing that is long overdue, and social science and sociobiology will be well served if sociobiologists seize the opportunity and organize a detailed case for the defense. Where Leavitt has identified lacunae in the paradigm, these need to be addressed. Where the data have been misrepresented or over-interpreted, either further observational work needs to be done or the data have to be jettisoned from the debate. weakness needs to be acknowledged rather than sidelined or ignored. And - to admit a criticism that is inevitable, whether it is true or not - if Leavitt has misconstrued the arguments or the data, the error needs to be explained in detail, not dismissed offhand. In fine, Leavitt's work offers a rare opportunity for us to advance social science in a manner commensurate with that of the physical sciences. There are two broader matters in social science to which Leavitt's inquiry also makes valuable contributions. The first concerns persistent attempts to apply Darwinian theory not to genes, as sociobiologists do, but to memes - culture. These endeavors have permeated social sciences as far apart as cognitive science and political science, but it is perhaps most prevalent in anthropology. In cultural anthropology, the most familiar manifestation is Marvin Harris's 'cultural materialism'. For many years, Harris stipulated that cultural complexes were adaptive and that they had evolved through some kind of Darwinian process. truly scientific archaeology it is now ascendant in archaeology in the form of Robert Dunnell's 'selectionism'. Here, as in sociobiology, Darwinian theory is applied to the understanding of complex human behaviors, but the evolutionary vehicle is the action of natural selection on cultural traits, which are explicitly treated as analogs of genes. If the underpinnings of sociobiology are as tenuous as Leavitt argues, how much more tendentious must be those of selectionism? To the problems Leavitt identifies in sociobiological theorizing must be added the further difficulties associated with treating cultural traits as gene equivalents - not least the problem of identifying the mechanism that fixes 'successful' cultural traits in a population in the way that the physico-chemical properties of the universe fix 'successful' genes in a population.

Download or read book Inbreeding Incest and the Incest Taboo written by Arthur P. Wolf and published by Stanford University Press. This book was released on 2005 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Why is incest widely prohibited? Why does the scope of the prohibition vary from society to society? Why does incest occur despite the prohibition? What are the consequences? To reexamine these questions, this book brings together contributions from the fields of genetics, behavioral biology, primatology, biological and social anthropology, philosophy, and psychiatry.

Download or read book Conservation Genetics written by V. Loeschcke and published by Birkhäuser. This book was released on 2013-03-11 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: It follows naturally from the widely accepted Darwinian dictum that failures of populations or of species to adapt and to evolve under changing environments will result in their extinction. Population geneti cists have proclaimed a centerstage role in developing conservation biology theory and applications. However, we must critically reexamine what we know and how we can make rational contributions. We ask: Is genetic variation really important for the persistence of species? Has any species become extinct because it ran out of genetic variation or because of inbreeding depression? Are demographic and environmental stochas ticity by far more important for the fate of a population or species than genetic stochasticity (genetic drift and inbreeding)? Is there more to genetics than being a tool for assessing reproductive units and migration rates? Does conventional wisdom on inbreeding and "magic numbers" or rules of thumb on critical effective population sizes (MVP estimators) reflect any useful guidelines in conservation biology? What messages or guidelines from genetics can we reliably provide to those that work with conservation in practice? Is empirical work on numerous threatened habitats and taxa gathering population genetic information that we can use to test these guidelines? These and other questions were raised in the invitation to a symposium on conservation genetics held in May 1993 in pleasant surroundings at an old manor house in southern Jutland, Denmark.

Download or read book The Natural History of Inbreeding and Outbreeding written by Nancy Wilmsen Thornhill and published by University of Chicago Press. This book was released on 1993-08-15 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inbreeding, the mating of close kin, and outbreeding, the mating of distant relatives or unrelated organisms, have long been important subjects to evolutionary biologists. Inbreeding reduces genetic diversity in a population, increasing the likelihood that genetic defects will become widespread and deprive a population of the diversity it may need to cope with its environment. Most plants and animals have evolved behavioral and morphological mechanisms to avoid inbreeding. However, today many endangered species exist only in small, very isolated populations where inbreeding is unavoidable, so it has become a concern for conservationists. In this volume, twenty-six experts in evolution, behavior, and genetics examine the causes and consequences of inbreeding. The authors ask whether inbreeding is as problematic as biologists have thought, under what ecological conditions inbreeding occurs, and whether organisms that inbreed have mechanisms to dampen the anticipated problems of reduced genetic variation. The studies, including theoretical and empirical work on wild and captive populations, demonstrate that many plants and animals inbreed to a greater extent than biologists have thought, with variable effects on individual fitness. Graduate students and researchers in evolutionary biology, animal behavior, ecology, and conservation biology will welcome this wide-ranging collection.

Download or read book Analysis of Complex Disease Association Studies written by Eleftheria Zeggini and published by Academic Press. This book was released on 2010-11-17 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to the National Institute of Health, a genome-wide association study is defined as any study of genetic variation across the entire human genome that is designed to identify genetic associations with observable traits (such as blood pressure or weight), or the presence or absence of a disease or condition. Whole genome information, when combined with clinical and other phenotype data, offers the potential for increased understanding of basic biological processes affecting human health, improvement in the prediction of disease and patient care, and ultimately the realization of the promise of personalized medicine. In addition, rapid advances in understanding the patterns of human genetic variation and maturing high-throughput, cost-effective methods for genotyping are providing powerful research tools for identifying genetic variants that contribute to health and disease. This burgeoning science merges the principles of statistics and genetics studies to make sense of the vast amounts of information available with the mapping of genomes. In order to make the most of the information available, statistical tools must be tailored and translated for the analytical issues which are original to large-scale association studies. Analysis of Complex Disease Association Studies will provide researchers with advanced biological knowledge who are entering the field of genome-wide association studies with the groundwork to apply statistical analysis tools appropriately and effectively. With the use of consistent examples throughout the work, chapters will provide readers with best practice for getting started (design), analyzing, and interpreting data according to their research interests. Frequently used tests will be highlighted and a critical analysis of the advantages and disadvantage complimented by case studies for each will provide readers with the information they need to make the right choice for their research. Additional tools including links to analysis tools, tutorials, and references will be available electronically to ensure the latest information is available. - Easy access to key information including advantages and disadvantage of tests for particular applications, identification of databases, languages and their capabilities, data management risks, frequently used tests - Extensive list of references including links to tutorial websites - Case studies and Tips and Tricks

Download or read book Encyclopedia of Rose Science written by Thomas Debener and published by Academic Press. This book was released on 2003-10-27 with total page 4142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Rose Science brings together a wealth of information on the rose, long treasured for its captivating perfumes and splendid colors. Now, more than ever, science plays a central place in the production of this flower at the center of one of the world's biggest floricultural industries. A team of internationally renowned experts has contributed scores of articles, from the history of rose cultivation to discoveries in rose genetics. For researchers and students, as well as commercial rose growers and breeders, the Encyclopedia of Rose Science is an invaluable reference. The Encyclopedia of Rose Science is available online on ScienceDirect. The print edition price for this reference work does not include online access. For more information on pricing for access to the online edition, please review our Licensing Options. The richness and authority of Elsevier reference works is now lent valuable functionality and accessibility through the online launch of Elsevier Reference Works on ScienceDirect. Features: Extensive browsing and searching across subject, thematic, alphabetical, author and cited author indexes - as applicable to the work Basic and advanced search functionality within volumes, parts of volumes, or across the whole work Ability to build, save and re-run searches as well as combine saved searches Internal cross-referencing between articles in the work, plus dynamic linking to journal articles and abstract databases, making navigation flexible and easy All articles are available as full-text HTML files, and as PDF files that can be viewed, downloaded or printed out in their original print format A dedicated Reference Works navigation tab and homepage on ScienceDirect to enable easy linking from your OPAC or library website For more information about the Elsevier Reference Works on ScienceDirect Program, please visit: http://www.info.sciencedirect.com/reference_works. Presents complete, up-to-date information on over 35 subject areas of major importance to rose scientists Encyclopedic format provides for concise, readable entires, easy searches, and extensive cross-references Incorporates MODERN ROSES XI, published by the American Rose Society as International Cultivar Registration Authority for Roses, the most comprehensive list of roses of historical and botanical importance! High quality full-color production, with many figures and tables

Download or read book The Evaluation of Forensic DNA Evidence written by National Research Council and published by National Academies Press. This book was released on 1996-12-12 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1992 the National Research Council issued DNA Technology in Forensic Science, a book that documented the state of the art in this emerging field. Recently, this volume was brought to worldwide attention in the murder trial of celebrity O. J. Simpson. The Evaluation of Forensic DNA Evidence reports on developments in population genetics and statistics since the original volume was published. The committee comments on statements in the original book that proved controversial or that have been misapplied in the courts. This volume offers recommendations for handling DNA samples, performing calculations, and other aspects of using DNA as a forensic toolâ€"modifying some recommendations presented in the 1992 volume. The update addresses two major areas: Determination of DNA profiles. The committee considers how laboratory errors (particularly false matches) can arise, how errors might be reduced, and how to take into account the fact that the error rate can never be reduced to zero. Interpretation of a finding that the DNA profile of a suspect or victim matches the evidence DNA. The committee addresses controversies in population genetics, exploring the problems that arise from the mixture of groups and subgroups in the American population and how this substructure can be accounted for in calculating frequencies. This volume examines statistical issues in interpreting frequencies as probabilities, including adjustments when a suspect is found through a database search. The committee includes a detailed discussion of what its recommendations would mean in the courtroom, with numerous case citations. By resolving several remaining issues in the evaluation of this increasingly important area of forensic evidence, this technical update will be important to forensic scientists and population geneticistsâ€"and helpful to attorneys, judges, and others who need to understand DNA and the law. Anyone working in laboratories and in the courts or anyone studying this issue should own this book.

Download or read book Racehorse Breeding Theories written by Frank J. Mitchell and published by The Russell Meerdink Company Ltd.. This book was released on 2004 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Here, in one volume, is a wide and varied assessment of the major breeding systems or theories, as well as the history and background of each. The writers give the reader all the necessary information they need to implement the theory and make it part of a breeding program. They also verify the relative scientific validity of the theories and various approaches to breeding" -- publisher website (April 2007).

Download or read book Introduction to Conservation Genetics written by Richard Frankham and published by Cambridge University Press. This book was released on 2010 with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt: This impressive author team brings the wealth of advances in conservation genetics into the new edition of this introductory text, including new chapters on population genomics and genetic issues in introduced and invasive species. They continue the strong learning features for students - main points in the margin, chapter summaries, vital support with the mathematics, and further reading - and now guide the reader to software and databases. Many new references reflect the expansion of this field. With examples from mammals, birds ...

Download or read book Conservation Biology written by Peggy L. Fiedler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: • • • John Harper • • • Nature conservation has changed from an idealistic philosophy to a serious technology. Ecology, the science that underpins the technol ogy of conservation, is still too immature to provide all the wisdom that it must. It is arguable that the desire to conserve nature will in itself force the discipline of ecology to identify fundamental prob lems in its scientific goals and methods. In return, ecologists may be able to offer some insights that make conservation more practicable (Harper 1987). The idea that nature (species or communities) is worth preserv ing rests on several fundamental arguments, particularly the argu ment of nostalgia and the argument of human benefit and need. Nostalgia, of course, is a powerful emotion. With some notable ex ceptions, there is usually a feeling of dismay at a change in the sta tus quo, whether it be the loss of a place in the country for walking or rambling, the loss of a painting or architectural monument, or that one will never again have the chance to see a particular species of bird or plant.

Download or read book Population Genetics and Microevolutionary Theory written by Alan R. Templeton and published by John Wiley & Sons. This book was released on 2006-09-29 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advances made possible by the development of molecular techniques have in recent years revolutionized quantitative genetics and its relevance for population genetics. Population Genetics and Microevolutionary Theory takes a modern approach to population genetics, incorporating modern molecular biology, species-level evolutionary biology, and a thorough acknowledgment of quantitative genetics as the theoretical basis for population genetics. Logically organized into three main sections on population structure and history, genotype-phenotype interactions, and selection/adaptation Extensive use of real examples to illustrate concepts Written in a clear and accessible manner and devoid of complex mathematical equations Includes the author's introduction to background material as well as a conclusion for a handy overview of the field and its modern applications Each chapter ends with a set of review questions and answers Offers helpful general references and Internet links

Download or read book Thoroughbred Breeding written by Matthew M. Binns and published by J.A. Allen. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are still many unknowns in the breeding of Thoroughbreds, but the international research coalition known as the Equine Genome Project is facilitating many new exciting discoveries. Dr. Matthew Binns is a leader of the project, an enterprise set up to map the equine genome, and with racing historian and bloodstock authority Tony Morris has written this important book on the theory, practice, art and science of Thoroughbred breeding. This long-awaited book describes how man came to express pedigree and to develop theories about it, and how practical breeders behaved in the light of their understanding. IT explains why many theories--including some still widely granted credibility today--are fallacious, examines the very real progress in knowledge since the principles of genetics were discovered, and focuses on the exciting developments of the last few years, when eminent geneticists have applied their expertise to the subject of the Thoroughbred. It has been the authors' endeavor to present the information in a form that may be readily understood by anyone who shares a love of the Thoroughbred and a fascination with what makes him what he is. Packed with absorbing history and cutting-edge science, this is a fascinating and illuminating book.

Download or read book Population Genetics Molecular Evolution and the Neutral Theory written by Motoo Kimura and published by University of Chicago Press. This book was released on 1994 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of this century's leading evolutionary biologists, Motoo Kimura revolutionized the field with his random drift theory of molecular evolution—the neutral theory—and his groundbreaking theoretical work in population genetics. This volume collects 57 of Kimura's most important papers and covers forty years of his diverse and original contributions to our understanding of how genetic variation affects evolutionary change. Kimura's neutral theory, first presented in 1968, challenged the notion that natural selection was the sole directive force in evolution. Arguing that mutations and random drift account for variations at the level of DNA and amino acids, Kimura advanced a theory of evolutionary change that was strongly challenged at first and that eventually earned the respect and interest of evolutionary biologists throughout the world. This volume includes the seminal papers on the neutral theory, as well as many others that cover such topics as population structure, variable selection intensity, the genetics of quantitative characters, inbreeding systems, and reversibility of changes by random drift. Background essays by Naoyuki Takahata examine Kimura's work in relation to its effects and recent developments in each area.

Download or read book The Agronomy and Economy of Important Tree Crops of the Developing World written by K.P. Prabhakaran Nair and published by Elsevier. This book was released on 2010-04-22 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major tree crops contribute substantially to the economy of many developing countries on the Asian, African and Latin American continents. For example, coffee is the main revenue earner for Kenya. This book provides a comprehensive review of the agronomy, botany, taxonomy, genetics, chemistry, economics, and future global prospects of a range of crops that have great food, industrial and economic value such as cocoa, coffee, cashew, oil palm and natural rubber. - Discusses the major tree crops of great economic value to the developing world - The author is an eminent scientist who has won numerous awards for his work in this area