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Sex Ratios
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Book Synopsis Too Many Women? by : Marcia Guttentag
Download or read book Too Many Women? written by Marcia Guttentag and published by SAGE Publications, Incorporated. This book was released on 1983-04 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: `The basic premise of this provocative book is a startling one - that sex ratios among people on the marriage market have profound consequences for a wide variety of attitudes, values, and behaviors, from sexual mores and behavior to shifts in economic power...the authors share with the reader a wealth of fascinating data and information...a book which is...fascinating, scholarly, provocative and exceedingly well-written.' -- Canadian Journal of Sociology, Vol 10 No 2 `Written by social scientists with training and considerable publication in social psychology, this book is a unique contribution to the literature on women, sex roles, and the history of relations between men and women. No similar book is available to
Download or read book Sex Ratios written by Ian Hardy and published by . This book was released on 2002 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sex ratios, the proportions of males and females in any given species, are important in evolutionary and behavioural ecology. This volume explores the context to and methods for many aspects of research on sex ratios, and will be an indispensable reference for all those working in this area.
Download or read book Sex Wars written by M. E. N. Majerus and published by Princeton University Press. This book was released on 2003 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Book Synopsis Sex Selection of Children by : Neil G. Bennett
Download or read book Sex Selection of Children written by Neil G. Bennett and published by Elsevier. This book was released on 2012-12-02 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sex Selection of Children explores the strategies used to control the sex of children, the conditions under which a couple would employ a given technique, and the technology to achieve their desired family composition. It also considers the social consequences of sex-selection techniques, the legal factors that might impinge on the use of such a technology, and the ethical considerations associated with its use. Organized into 10 chapters, this book begins with an overview of some of the more humorous past approaches to sex selection. It then discusses the effects of sex selection on fertility, sex selection by means of amniocentesis and selective abortion, and the theorized link between the timing of fertilization and the sex ratio of offspring. A chapter considers a decision-making model that describes the use of sex-selection techniques by couples who wish to have a specific number of children over their entire childbearing period, while another chapter analyzes the economics of sex preference and selection. The remaining chapters address the parental preferences about the sexes of their offspring in different societies, the legal aspects of prenatal sex selection, a moral policy for sex choice, and the ethics and public policy on sex choice. This book is a valuable resource for specialists involved in fields ranging from sociology and economics to biology, public health, law, and ethics.
Book Synopsis Intersexuality in the Animal Kingdom by : R. Reinboth
Download or read book Intersexuality in the Animal Kingdom written by R. Reinboth and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: When Richard Goldschmidt' coined the term "intersexuality" in 1915, he intended it to apply to normally dioecious species which exhibit some kind of mixture between male and female characters. However, as knowledge of the bewildering variability present in the sexual orga nization of members of the animal kingdom has increased, the original meaning of the word has changed. Today many authors define inter sexuality as "the presence of both male and female characteristics, or of intermediate sexual characteristics, in a single individual".2 This more extensive and widely accepted concept justifies the title of our book •. Among all the anatomical and physiological features of living organisms the reproductive system has a unique importance for the perpetuation of the species. Conversely, reproductive processes are of little or no account for the viability of the individual. Therefore, within the framework of general biology reproduction has all too often been looked at solely from the point of view of genetics. Lively discussions about genotypic versus phenotypic sex determination long dominated the sci entific literature on sexuality in animals; this one-sided emphasis has tended to obscure many important facets of an organism's ability to reproduce. Recent developments in current biological research have brought the classic problem of sex differentiation into focus again, and the rapid progress being made in comparative endocrinology has added a new di mension to the study of reproductive biology.
Book Synopsis Gender and Sexual Dimorphism in Flowering Plants by : Monica A. Geber
Download or read book Gender and Sexual Dimorphism in Flowering Plants written by Monica A. Geber and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in the field, this book examines the evolutionary advantages of gender dimorphism and sexual dimorphism in flowering plants. Divided into three sections: the first introduces readers to the tremendous variety of breeding systems and their evolution in plants and sets the stage for a consideration of the evolution of dimorphism in reproductive and non-reproductive characters. The second section deals with the evolution of secondary sexual characters, including the theory related to the evolution of sexual dimorphism and its empirical patterns, while the last section deals with the genetics of gender expression and of secondary sexual characters.
Book Synopsis The Oxford Handbook of Women and Competition by : Maryanne Fisher
Download or read book The Oxford Handbook of Women and Competition written by Maryanne Fisher and published by Oxford University Press. This book was released on 2017 with total page 857 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oxford Handbook of Women and Competition is one of the first scholarly volumes to focus specifically on competition and the competitive forces between women. Chapters provide readers with a definitive view of the current state of research, and collectively address the adaptive and socio-cultural foundations of women's competitive behavior, motivations, and cognitions.
Book Synopsis Maternal Personality, Evolution and the Sex Ratio by : Valerie J. Grant
Download or read book Maternal Personality, Evolution and the Sex Ratio written by Valerie J. Grant and published by Routledge. This book was released on 2006-10-19 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Women who are dominant are more likely to have sons. Demographic studies show that more male children are born after wars, yet most people believe that their baby's sex is a matter of chance - determined by the father's sperm. Valerie Grant presents evidence that the mother's personality - which is related to female testosterone levels - can actually influence which type of sperm fertilises the egg. Using data from human and animal studies Valerie Grant discusses the implications for human evolution, developmental psychology and reproductive biology. Her claims are controversial and the implications of her findings far reaching. Whether mothers have sons or daughters may not be a matter of chance. It may depend on which sex infant the mother is more suited to raise.
Book Synopsis The Theory of Sex Allocation. (MPB-18), Volume 18 by : Eric L. Charnov
Download or read book The Theory of Sex Allocation. (MPB-18), Volume 18 written by Eric L. Charnov and published by Princeton University Press. This book was released on 2020-03-31 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive treatment of sex allocation from the standpoint of modern evolutionary theory. It shows how the determination of sex ratio, resource allocation to sperm versus egg within simultaneous hermaphroditism, and the evolution of sex reversal can he explained as examples of a single process. The genetical theory, developed mostly with graphical arguments, also specifies when hermaphroditism and dioecy are themselves evolutionary stable. The work balances theory with field and laboratory research, providing critical tests of the theory by empirical studies of sex ratio in parasitoid wasps and mites, sex reversal in shrimp and coral reef fish, and allocation of resources to pollen versus seeds in higher plants. In addition, the author oilers an encyclopedic review of the field and laboratory work of other scientists, reviews many as yet untested hypotheses in sex allocation, and points toward numerous plant and animal systems that hold promise for future tests.
Download or read book The Laboratory Primate written by and published by Elsevier. This book was released on 2005-09-19 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: A volume in the Handbook of Experimental Animals series, The Laboratory Primate details the past and present use of primates in biomedical research, and the husbandry, nutritional requirements, behaviour, and breeding of each of the commonly used species. Practical information on regulatory requirements, not available in other texts, is covered. Sections on experimental models cover the major areas of biomedical research, including AIDS, cancer, neurobiology and gene therapy. Assisted reproductive technology, tissue typing, and minimum group sizes for infectious disease/vaccine studies are also included. Two-color, user-friendly format, with copious illustrations and color plates Includes detailed, well-illustrated sections on gross & microscopic anatomy, common diseases, and special procedures, including surgical techniques
Book Synopsis Bare Branches by : Valerie M. Hudson
Download or read book Bare Branches written by Valerie M. Hudson and published by National Geographic Books. This book was released on 2005-09-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: What happens to a society that has too many men? In this provocative book, Valerie Hudson and Andrea den Boer argue that, historically, high male-to-female ratios often trigger domestic and international violence. Most violent crime is committed by young unmarried males who lack stable social bonds. Although there is not always a direct cause-and-effect relationship, these surplus men often play a crucial role in making violence prevalent within society. Governments sometimes respond to this problem by enlisting young surplus males in military campaigns and high-risk public works projects. Countries with high male-to-female ratios also tend to develop authoritarian political systems. Hudson and den Boer suggest that the sex ratios of many Asian countries, particularly China and India—which represent almost 40 percent of the world's population—are being skewed in favor of males on a scale that may be unprecedented in human history. Through offspring sex selection (often in the form of sex-selective abortion and female infanticide), these countries are acquiring a disproportionate number of low-status young adult males, called "bare branches" by the Chinese. Hudson and den Boer argue that this surplus male population in Asia's largest countries threatens domestic stability and international security. The prospects for peace and democracy are dimmed by the growth of bare branches in China and India, and, they maintain, the sex ratios of these countries will have global implications in the twenty-first century.
Book Synopsis Choosing Sexes by : Kristen J. Navara
Download or read book Choosing Sexes written by Kristen J. Navara and published by Springer. This book was released on 2018-02-01 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is extensive evidence that vertebrates of all classes have the ability to control the sexes of the offspring they produce. Despite dramatic differences in the mechanisms by which different taxa determine the initial sex of offspring, each group has found its own way of adjusting offspring sex ratios in response to social and environmental cues. For example, stress is a well-known modulator of offspring sex in members of all groups studied to date. Food availability, and limitation in particular, is another common cue that stimulates biases in offspring sex ratios in a wide variety of species. Offspring sex can be adjusted at the primary level, which occurs prior to conception, or at the secondary level, during embryonic development. While the mechanistic pathways that ultimately result in sex ratio biases and the developmental time-points sensitive to those mechanisms likely differ among taxa, the key involvement of steroid hormones in the process of sex ratio adjustment appears to be pervasive throughout. This book reviews the systems of sex determination at play in different vertebrate groups, summarizes the evidence that members of all vertebrate taxa can facultatively adjust offspring sex, and discusses when and how these adjustments can take place.
Book Synopsis Theoretical Studies on Sex Ratio Evolution. (MPB-22), Volume 22 by : Samuel Karlin
Download or read book Theoretical Studies on Sex Ratio Evolution. (MPB-22), Volume 22 written by Samuel Karlin and published by Princeton University Press. This book was released on 2020-03-31 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a key area of population genetics: the ratio of the sexes in a population, or the allocation of resources to male versus female reproductive function. Samuel Karlin and Sabin Lessard establish the formal theoretical aspects of the evolution of sex ratio within the constraints of genetic mechanisms of sex determination. Their results generalize and unify existing work on the topic, strengthening previous conceptions in some cases and, in other instances, offering new directions of research. There are two main approaches to understanding the causes and effects of sex ratio. One approach focuses on the optimization and adaptive functions of sex allocation, while the other emphasizes the consequences of genetic sex determination mechanisms. In discussing the utility of these two approaches, Professors Karlin and Lessard examine the principal sex-determining mechanisms and facts involved in sex ratio representations, the various genetic and environmental factors that contribute to adaptive sex expression, and the evolution of sex determining systems and controls. From a population genetic perspective, the authors derive evolutionary properties in support of the high incidence of 1:1 sex ratio in natural populations and investigate the conditions that can explain the occurrence of biased sex ratio.
Book Synopsis The Children of Atomic Bomb Survivors by : National Research Council
Download or read book The Children of Atomic Bomb Survivors written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do persons exposed to radiation suffer genetic effects that threaten their yet-to-be-born children? Researchers are concluding that the genetic risks of radiation are less than previously thought. This finding is explored in this volume about the children of atomic bomb survivors in Hiroshima and Nagasakiâ€"the population that can provide the greatest insight into this critical issue. Assembled here for the first time are papers representing more than 40 years of research. These documents reveal key results related to radiation's effects on pregnancy termination, sex ratio, congenital defects, and early mortality of children. Edited by two of the principal architects of the studies, J. V. Neel and W. J. Schull, the volume also offers an important comparison with studies of the genetic effects of radiation on mice. The wealth of technical details will be immediately useful to geneticists and other specialists. Policymakers will be interested in the overall conclusions and discussion of future studies.
Book Synopsis The Descent of Human Sex Ratio at Birth by : Éric Brian
Download or read book The Descent of Human Sex Ratio at Birth written by Éric Brian and published by Springer Science & Business Media. This book was released on 2007-07-24 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an attempt to renew our links with the oldest traditions of scholarly thinking, but is also a well-tempered reflection on today’s work in objectivization. After a deconstruction of the past and present conditions of scientific understanding of human sex-ratio at birth, the authors propose a reconstruction of the dynamics of the phenomenon based on stochastics. Appendices provide information on the first expression of sex ratio trends, as well as a comparison of Darwin’s treatments of the subject.
Book Synopsis Dragonflies and Damselflies by : Alex Córdoba-Aguilar
Download or read book Dragonflies and Damselflies written by Alex Córdoba-Aguilar and published by OUP Oxford. This book was released on 2008-08-28 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dragonflies and Damselflies documents the latest advances in odonate biology and relates these to a broader ecological and evolutionary research agenda. Despite being one of the smallest insect orders, dragonflies offer a number of advantages for both laboratory and field studies. In fact, they have been crucial to the advancement of our understanding of insect ecology and evolution. This book provides a critical summary of the major advances in these fields. Contributions from many of the leading researchers in dragonfly biology offer new perspectives and paradigms as well as additional, unpublished, data. The editor has carefully assembled a mix of theoretical and applied chapters (including those addressing conservation and monitoring) and achieves a balance of emerging and established research topics, providing suggestions for future study in each case. This accessible text is not about dragonflies per se but an essential source of knowledge that describes how different sets of evolutionary and ecological principles/ideas have been tested on a particular taxon. It will therefore be suitable for graduate students and researchers in entomology, evolutionary biology, population and behavioural ecology, and conservation biology. It will of course be of particular interest and use to those working on insects and an indispensable reference text for odonate biologists.
Book Synopsis Social Evolution in Ants by : Andrew F.G. Bourke
Download or read book Social Evolution in Ants written by Andrew F.G. Bourke and published by Princeton University Press. This book was released on 1995-11-05 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biologists have long been intrigued and confounded by the complex issues in the evolution and ecology of the social behaviour of insects. The self-sacrifice of sterile workers in ant colonies has been particularly difficult for evolutionary biologists to explain. This text presents an overview of the current state of scientific knowledge about social evolution in ants and shows how studies on ants have contributed to an understanding of many fundamental topics in behavioural ecology and evolutionary biology.
