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Author: Kristen J. Navara
Publisher: Springer
ISBN: 3319712713
Category : Science
Languages : en
Pages : 246
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Book Description
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.
Author: Kristen J. Navara
Publisher: Springer
ISBN: 3319712713
Category : Science
Languages : en
Pages : 246
Get Book Here
Book Description
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.
Author: Elisa Janine Sobo
Publisher: University of Pennsylvania Press
ISBN: 9780812215533
Category : Health & Fitness
Languages : en
Pages : 252
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Book Description
Choosing Unsafe Sex focuses on the ways in which condom refusal and beliefs regarding HIV testing reflect women's hopes for their relationships and their desires to preserve status and self-esteem. It also discusses the related issue of seropositivity concealment or non-disclosure. Many of the inner-city women who participated in Dr. Sobo's research were seriously involved with one man, and they had heavy emotional and social investments in believing or maintaining that their partners were faithful to them. Uninvolved women had similarly heavy investments in their abilities to identify or choose potential partners who were HIV-negative. In either case, women sought to present and to view themselves as wise and their men as monogamous. Women did not see themselves as being at risk for HIV infection, and so they saw no need for condoms. But they did recommend that other women use them; they saw other women as quite likely to be involved with sexually unfaithful men. Choosing Unsafe Sex includes recommendations for educational strategies that are sensitive to cultural expectations for relationships. Dr. Sobo's findings have significance not only for inner-city HIV/AIDS educators but for all who seek a deeper understanding of mainstream assumptions about heterosexual relationships.
Author: Mara Hvistendahl
Publisher: ReadHowYouWant.com
ISBN: 1459614577
Category : Political Science
Languages : en
Pages : 546
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Book Description
"Lianyungang, a booming port city, has China's most extreme gender ratio for children under four: 163 boys for every 100 girls. These numbers don't seem terribly grim, but in ten years, the skewed sex ratio will pose a colossal challenge. By the time those children reach adulthood, their generation will have twenty-four million more men than women. The prognosis for China's neighbors is no less bleak: Asia now has 163 million females "missing" from its population. Gender imbalance reaches far beyond Asia, affecting Georgia, Eastern Europe, and cities in the U.S. where there are significant immigrant populations. The world, therefore, is becoming increasingly male, and this mismatch is likely to create profound social upheaval. Historically, eras in which there have been an excess of men have produced periods of violent conflict and instability. Mara Hvistendahl has written a stunning, impeccably-researched book that does not flinch from examining not only the consequences of the misbegotten policies of sex selection but Western complicity with them"--
Author: Candida March
Publisher: Oxfam
ISBN: 9780855984038
Category : Social Science
Languages : en
Pages : 148
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Book Description
This is a single-volume guide to all the main analytical frameworks for gender-sensitive research and planning. It draws on the experience of trainers and practitioners, and includes step-by-step instructions for using the frameworks.
Author: David M. Rorvik
Publisher:
ISBN: 9780553103359
Category : Diagnostic sex determination
Languages : en
Pages : 114
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Book Description
Author: Ingo Schlupp
Publisher: Oxford University Press
ISBN: 0198818947
Category : Science
Languages : en
Pages : 177
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Book Description
When Charles Darwin first proposed Sexual Selection Theory, he suggested two mechanisms: competition among males and choice by females. Although their importance is long established and extremely well understood, their mirror images have remained largely underappreciated; males also choose, and females also compete. The combination of male mate choice (MMC) and female competition (FC) may be one of the most overlooked yet important and intriguing phenomena in modern sexual selection theory. This novel text reviews our current understanding of MMC and FC, highlighting the important connections between them. It places both concepts in the context of related fields such as female choice, mating systems, and sexual selection theory more broadly. A truly holistic approach is provided which takes all the relevant elements into consideration, especially the relative roles of MMC and FC, female ornamentation, their evolutionary consequences, and their genetic basis. Considering male mate choice and female competition in this way as effectively two sides of the same coin creates a powerful paradigm for a more complete understanding of sexual selection. Male Choice, Female Competition, and Female Ornaments in Sexual Selection will be suitable for both graduate students and researchers interested in sexual selection from an evolutionary, psychological, and anthropological perspective. It will also appeal to a broader audience of behavioural ecologists and evolutionary psychologists.
Author: Nancy Kimberly Dess
Publisher: Oxford University Press
ISBN: 0190658541
Category : Family & Relationships
Languages : en
Pages : 377
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Book Description
This volume is a compendium of conceptual frameworks and associated research approaches used for inquiry into gender, sex, and sexualities. It is suitable for use as an advanced textbook.
Author: Mark Peters Phd
Publisher: Penguin
ISBN: 1615644504
Category : Language Arts & Disciplines
Languages : en
Pages : 365
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Book Description
Mastering the details of English grammar and style can be a slow and painful process. With clear, no-nonsense explanations and examples, Idiot's Guides: Grammar and Style makes learning the finer points of the English language easy. The book focuses on what people really need to know — the mechanics of writing, the parts of speech, proper punctuation and capitalization, and the most common errors (and how to avoid and fix them). Exercises that reinforce learning are also packed into this helpful guide.
Author: Liza Reisel
Publisher: Emerald Group Publishing
ISBN: 1785603469
Category : Social Science
Languages : en
Pages : 314
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Book Description
This book investigates the contexts of gender segregation in vocational education (VET) from a cross-national, comparative perspective. It tackles questions about occupational expectations, gendered pathways to applied fields of study, feminization of occupations and the relationship between educational choice and opportunity structures.
Author: Henry T. Greely
Publisher: Harvard University Press
ISBN: 0674728963
Category : Law
Languages : en
Pages : 392
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Book Description
“Will the future confront us with human GMOs? Greely provocatively declares yes, and, while clearly explaining the science, spells out the ethical, political, and practical ramifications.”—Paul Berg, Nobel Laureate and recipient of the National Medal of Science Within twenty, maybe forty, years most people in developed countries will stop having sex for the purpose of reproduction. Instead, prospective parents will be told as much as they wish to know about the genetic makeup of dozens of embryos, and they will pick one or two for implantation, gestation, and birth. And it will be safe, lawful, and free. In this work of prophetic scholarship, Henry T. Greely explains the revolutionary biological technologies that make this future a seeming inevitability and sets out the deep ethical and legal challenges humanity faces as a result. “Readers looking for a more in-depth analysis of human genome modifications and reproductive technologies and their legal and ethical implications should strongly consider picking up Greely’s The End of Sex and the Future of Human Reproduction... [It has] the potential to empower readers to make informed decisions about the implementation of advancements in genetics technologies.” —Dov Greenbaum, Science “[Greely] provides an extraordinarily sophisticated analysis of the practical, political, legal, and ethical implications of the new world of human reproduction. His book is a model of highly informed, rigorous, thought-provoking speculation about an immensely important topic.” —Glenn C. Altschuler, Psychology Today
