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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
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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: Elisa Janine Sobo
Publisher: University of Pennsylvania Press
ISBN: 9780812215533
Category : Social Science
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: David M. Rorvik
Publisher:
ISBN: 9780553103359
Category : Diagnostic sex determination
Languages : en
Pages : 114
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Book Description
Author: Landrum B. Shettles
Publisher: Harmony
ISBN: 0767926102
Category : Health & Fitness
Languages : en
Pages : 256
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Book Description
For almost forty years, How to Choose the Sex of Your Baby has been the standard reference for couples trying to increase their chances of having the son or daughter they hope for. In this new edition of their classic book, Dr. Shettles and David Rorvik provide authoritative scientific studies and compelling anecdotal evidence demonstrating that the Shettles method continues to produce results unmatched by any other method. Dozens of testimonials confirm its ease of use and rate of success. How to Choose the Sex of Your Baby explains the simple, at-home, noninvasive Shettles method and presents detailed steps to take to conceive a child of a specific gender. The properly applied Shettles method gives couples a 75 percent or better chance of having a child of the desired sex. Some researchers have reported success rates of up to 90 percent!
Author: National Academy of Sciences
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 388
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Book Description
The Arthur M. Sackler Colloquia of the National Academy of Sciences address scientific topics of broad and current interest, cutting across the boundaries of traditional disciplines. Each year, four or five such colloquia are scheduled, typically two days in length and international in scope. Colloquia are organized by a member of the Academy, often with the assistance of an organizing committee, and feature presentations by leading scientists in the field and discussions with a hundred or more researchers with an interest in the topic. Colloquia presentations are recorded and posted on the National Academy of Sciences Sackler colloquia website and published on CD-ROM. These Colloquia are made possible by a generous gift from Mrs. Jill Sackler, in memory of her husband, Arthur M. Sackler.
Author: E. J. Sobo
Publisher: University of Pennsylvania Press
ISBN: 0812200373
Category : Medical
Languages : en
Pages : 244
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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. 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. 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, whom they saw as quite likely to be involved with sexually unfaithful men, use them.
Author: Hazel Phillips
Publisher: Bloomsbury Paperbacks
ISBN: 9780747533139
Category : Family & Relationships
Languages : en
Pages : 184
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Book Description
This practical guide shows readers a natural method of choosing the sex of a baby. It gives advice on health, diet, sperm count and ovulation in an easy-to-follow manner. The testimonies of numerous parents throughout the world reflects the success of the author's method.
Author: Gretchen Neigh
Publisher: Academic Press
ISBN: 0128026081
Category : Science
Languages : en
Pages : 236
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Book Description
Sex Differences in Physiology is an all-encompassing reference that details basic science research into sex differences in all physiological fields. It includes scientific discoveries concerning sex differences in cardiovascular, respiratory, renal, gastrointestinal, and musculoskeletal physiology. In addition, coverage of the development, endocrinology, neurophysiology, immunity, and metabolism is included, making this important reference a resource that will meet the needs of investigators interested in incorporating sex differences into their research programs, while also providing clinicians with the basis for providing the best sex-based medical treatment options available. Provides a sweeping, organ-by-organ review of currently observed sex differences in animal models and human disease Explains how sex differences influence physiology and disease Provides the critical knowledge on sex differences for better understanding of prevention and treatment of diseases
Author: Charles Darwin
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Book Description
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"--
