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Heredity, 2002 Sex ratio theory attempts to explain variation at all levels (species, population, individual, brood) in the proportion of offspring that are male (the sex ratio). In many cases this work has been extremely successful, providing qualitative and even quantitative explanations of sex ratio variation.
West, Stuart A +2 more
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Does the Mother or Father Determine the Offspring Sex Ratio? Investigating the Relationship between Maternal Digit Ratio and Offspring Sex Ratio. [PDF]
PLoS ONE, 2015 In mammals, high parental testosterone levels present around the time of conception are thought to skew offspring sex ratio toward sons. The second to fourth digit ratio (digit ratio) is now widely accepted as a negative correlate of prenatal ...
Tae Beom Kim +4 more
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Current Biology, 2017 Jennions et al. introduce the different kinds of sex ratio and their biology.
Jennions, Michael D. +3 more
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Mate limitation and sex ratio evolution [PDF]
Royal Society Open Science, 2018 Sex ratio evolution has been one of the most successful areas of evolutionary theory. Pioneered by Düsing and Fisher under panmixia, and later extended by Hamilton to cover local mate competition (LMC), these models often assume, either implicitly or ...
Jussi Lehtonen, Lisa E. Schwanz
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eLife, 2022 Preference for sons and smaller families and, in the case of China, a one-child policy, have contributed to missing girl births in India and China over the last few decades due to sex-selective abortions.
Catherine Meh, Prabhat Jha
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Sex ratio elasticity influences the selection of sex ratio strategy [PDF]
Scientific Reports, 2016 There are three sex ratio strategies (SRS) in nature—male-biased sex ratio, female-biased sex ratio and, equal sex ratio depending on the proportion of male offspring being greater than, less than, or equal to ½. The problem was already noted in Darwin’s (1859) “ Origin of Species,
Wang, Yaqiang +3 more
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Social Sciences, 2023 Researchers have long puzzled over suicidal behavior. In this paper, we posit that when people are unable to attract mates given unfavorable sex ratios, suicide rates increase. Sex ratio, the proportion of males in a population, is linked to a variety of
Kristin Snopkowski, Hallie Turner
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Parasite stress predicts offspring sex ratio. [PDF]
PLoS ONE, 2012 In this study, I predict that the global variation of offspring sex ratio might be influenced in part by the level of parasite stress. From an energetic standpoint, higher gestational costs of producing a male offspring could decrease male births in a ...
Madhukar Shivajirao Dama
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Comparison of the effect of sex ratio on the Partridge Alectoris chukar performance, which was bred under standard conditions in Nineveh [PDF]
مجلة جامعة كركوك للعلوم الزراعية, 2021 The research was carried out in the Livestock Research Division / Nineveh Research Department to study the effect of four different treatments of Sex ratio male: female (1: 1, 1: 2, 1: 3 and 1: 4), using 477 birds at production age, for 10 weeks on the ...
Firas Ibrahim +2 more
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Recent sex ratio at birth in China
BMJ Global Health, 2021 Background China’s sex ratio at birth (SRB) has declined in the past decade but still exceeds the normal level. This study seeks to depict the SRB trend in the past two decades.Methods We depicted the SRB trend, including SRB by birth order, children ...
Quanbao Jiang, Cuiling Zhang
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