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Weed gave up sex long ago
08-07-2007 · EurekAlert!The ability of plants to self-pollinate -- a big factor in the spread of weeds -- is much older than previously thought in one widely studied species, biologists from five leading institutions say. The findings show that at least in plant evolution, sex with others may bemore trouble than it's worth.
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- Gendered division of labor gave modern humans advantage over Neanderthals
12-04-2006 · EurekAlert!
Diversified social roles for men, women and children may have given Homo sapiens an advantage over Neanderthals, says a new study in the December 2006 issue of Current Anthropology. The study argues that division of economic labor by sex and age emerged relatively recently in human evolutionary history and facilitated the spread of modern humans throughout Eurasia.
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- Narwhals May Produce Signature Vocalizations For Communications
10-02-2006 · ScienceDaily
Scientists have found preliminary evidence that narwhals, Arctic whales whose spiraled tusks gave rise to the myth of the unicorn, produce signature vocalizations that may facilitate individual recognition or their reunion with more distant group members.
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- 3 wishes for a future Internet? Geni Project will soon be at your command
05-21-2007 · EurekAlert!
If the proverbial genie gave Internet users three wishes for an improved network, what would they ask for? Peace of mind about secure financial transactions? Protection from hackers? Inventive new applications that improve the quality of life?
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- Michigan State researcher traces the evolution of honey bee gender
10-27-2006 · EurekAlert!
A first-of-its-kind evolutionary strategy discovered among invertebrate organisms -- or honey bees -- shows how a complex genetic mechanism determines gender and maximizes gene transmission to the next generation of several bee species."This research gives us a better understanding of the sex-determining system of honey bees, as well as the age and evolutionary history of the csd (complementary sex determination) gene," said Zachary Huang, an MSU associate professor of entomology.
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- New clues to how sex evolves
12-04-2006 · EurekAlert!
Researchers at the Department of Energy's Lawrence Berkeley National Laboratory and the University of California at Berkeley have found clues to part of the complex question of how sex evolves, through ongoing studies of the nematode Caenorhabditis elegans. They have identified a key family of genes that code for closely related zinc-finger proteins that help bring C. elegans chromosomes together during meiosis, the specialized cell division that produces gametes, or sex cells.
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- Good for the goose, not so great for the gander
02-07-2007 · EurekAlert!
A provocative new model proposed by USC molecular biologist John Tower may help answer an enduring scientific question: Why do women tend to live longer than men? The model suggests how, on a genetic level, the evolution of aging and sex may be inextricably linked. It concludes that sexual differentiation processes may exact a high biological cost -- reduced function of the cell’s mitochondria and shorter life span in males.
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- Unsafe sex: Do feelings matter?
03-20-2007 · EurekAlert!
According to the Centers for Disease Control, adolescents and young adults currently account for fifty percent of new HIV infections on an annual basis. As a result, ongoing research and information on HIV prevention has become a high priority for this age group. Now a new study reveals that helping adolescents manage their emotions may be just as important as providing them with information on the practical side of safe sex in order to prevent HIV and other sexually transmitted infections.
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- Sex on the brain
05-07-2007 · EurekAlert!
New evidence on sex differences in people's brains and behaviors emerges with the publication of results from the British Broadcasting Corporation's (BBC) Sex ID Internet Survey. Survey questions and tests focused on participants' sex-linked cognitive abilities, personality traits, interests, sexual attitudes and behavior, as well as physical traits. The Archives of Sexual Behavior¹ has devoted a special section in its April 2007 issue to research papers based on the BBC data.
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- Sex in the morning or the evening?
06-25-2007 · EurekAlert!
Male fowl are more sexually active in the evening when fertilization is more likely, but females change depending on the population. Females solicit sex in the evening in female-biased populations, where females have more control. However, in male-biased populations, male sexual harassment of females is intense, especially in the evening, so females solicit sex early in the morning and avoid males in the evening.
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- A sensory organ, not the brain, differentiates male and female behavior in some mammals
08-05-2007 · EurekAlert!
Biologists at Harvard University have found that the epicenter of sex-specific behavior in many species may be a small sensory organ found in the noses of all terrestrial vertebrates except higher primates. Their work, appearing this week in the journal Nature, indicates that defects in this organ, known as the vomeronasal organ, lead female mice to adopt male behaviors such as mounting and pelvic thrusting while abandoning female behaviors such as nesting and nursing.
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