Results 11 to 20 of about 3,912 (263)
Sexual Conflict: The Battle of the Sexes Reversed [PDF]
Current Biology, 2008 In most species one sex is more reluctant to mate than the other. Standard explanations invoking potential reproductive rates have shortcomings that are illustrated by a new study of eager female and reluctant male antelopes.
Kokko, Hanna, Jennions, Michael
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Extreme Reversed Sexual Dichromatism in a Bird Without Sex Role Reversal [PDF]
Science, 2005 Brilliant plumage is typical of male birds, reflecting differential enhancement of male traits when females are the limiting sex. Brighter females are thought to evolve exclusively in response to sex role reversal. The striking reversed plumage dichromatism of Eclectus roratus parrots does not fit this pattern.
Heinsohn, Robert +2 more
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Switches, stability and reversals in the evolutionary history of sexual systems in fish [PDF]
Nature Communications, 2021 Abstract Sexual systems are highly diverse and have profound consequences for population dynamics and resilience. Yet, little is known about how they evolved. Using phylogenetic Bayesian modelling and a sample of 4614 species, we show that gonochorism is the likely ancestral condition in teleost fish.
Susanna Pla +3 more
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Epigenetic modification and inheritance in sexual reversal of fish [PDF]
Genome Research, 2014 Environmental sex determination (ESD) occurs in divergent, phylogenetically unrelated taxa, and in some species, co-occurs with genetic sex determination (GSD) mechanisms. Although epigenetic regulation in response to environmental effects has long been proposed to be associated with ESD, a systemic analysis on epigenetic regulation of ESD is still ...
Shao, Changwei +17 more
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Reversed Sexual Conflict in a Promiscuous Antelope [PDF]
Current Biology, 2007 A general tenet of sexual conflict theory is that males have higher optimum mating rates than do females and therefore should be more persistent when it comes to mating. However, in promiscuous species, females might benefit from high mating rates as a result of increased conception probability with favored males, whereas favored males benefit from ...
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Male refractory hypospadias with sexual reversal: a case report
Journal of Medical Case Reports, 2023 Abstract Background Hypospadias is one of the most prevalent urogenital malformations in clinic. However, some hypospadias may have a more complex disorder of sex development. Usually, hypospadias in these patients is severe. Among them, the 46,XX male sex reversal syndrome is a rare disorder of sex development, and this
Jianfeng Zhao +3 more
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Sexual inactivity results in reversible reduction of LH bioavailability [PDF]
International Journal of Impotence Research, 2002 We have recently documented significantly reduced serum testosterone (T) levels in patients with erectile dysfunction (ED). To understand the mechanism of this hypotestosteronemia, which was independent of the etiology of ED, and its reversibility only in patients in whom a variety of nonhormonal therapies restored sexual activity, we measured serum ...
CAROSA E +6 more
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Sildenafil citrate-restored eNOS and PDE5 regulation in sickle cell mouse penis prevents priapism via control of oxidative/nitrosative stress. [PDF]
PLoS ONE, 2013 Sildenafil citrate revolutionized the practice of sexual medicine upon its federal regulatory agency approval approximately 15 years ago as the prototypical phosphodiesterase type 5 inhibitor indicated for the treatment of male erectile dysfunction.
Trinity J Bivalacqua +5 more
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Semina: Ciências Agrárias, 2008 The present experimentwas undertaken out to evaluate the performance and the survival of Nile tilapia (Oreochromis niloticus) in the sexual reversion phase.
Adilson Reidel +5 more
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Rapid evolution of sex pheromone-producing enzyme expression in Drosophila. [PDF]
PLoS Biology, 2009 A wide range of organisms use sex pheromones to communicate with each other and to identify appropriate mating partners. While the evolution of chemical communication has been suggested to cause sexual isolation and speciation, the mechanisms that govern
Troy R Shirangi +3 more
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