News tagged with females
Faithful females who choose good providers key to evolutionary shift to modern family, study finds
In early human evolution, when faithful females began to choose good providers as mates, pair-bonding replaced promiscuity, laying the foundation for the emergence of the institution of the modern family, a new study finds.
Other Sciences / Social Sciences
May 28, 2012 |
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Brightly colored bird bills indicate good health
Troy Murphy has found female bill colour reflects the health of the bird. Females with more colourful bills have higher antibody levels, indicating greater strength and the ability to fight off invaders.
May 24, 2012 |
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Men can rest easy -- sex chromosomes are here to stay
Fears that sex-linked chromosomes, such as the male Y chromosome, are doomed to extinction have been refuted in a new genetic study which examines the sex chromosomes of chickens.
May 08, 2012 |
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Pregnant gelada monkeys abort when new male enters group
(PhysOrg.com) -- Pregnant female geladas show an unusually high rate of miscarriage the day after the dominant male in their group is replaced by a new male, a new University of Michigan study indicates.
Feb 23, 2012 |
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Female bonobos use homosexual sex to increase social status
(PhysOrg.com) -- Female bonobos (Pan paniscus) often form strong bonds with other females, and these bonds affect their position in the social hierarchy. Scientists from St Andrews University in the UK loo ...
Mar 02, 2012 |
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The power of estrogen -- male snakes attract other males
A new study has shown that boosting the estrogen levels of male garter snakes causes them to secrete the same pheromones that females use to attract suitors, and turned the males into just about the sexiest ...
Feb 10, 2012 |
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Female terrorists' bios belie stereotypes, study finds
Much like their male counterparts, female terrorists are likely to be educated, employed and native residents of the country where they commit a terrorist act, according to new research published by the American Psychological ...
Other Sciences / Social Sciences
May 15, 2012 |
not rated yet |
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Scientists identify odor molecules that hamper mosquitoes' host-seeking behavior
Female mosquitoes are efficient carriers of deadly diseases such as malaria, dengue and yellow fever, resulting each year in several million deaths and hundreds of millions of cases.
Jun 01, 2011 |
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Making blood-sucking deadly for mosquitoes
Inhibiting a molecular process cells use to direct proteins to their proper destinations causes more than 90 percent of affected mosquitoes to die within 48 hours of blood feeding, a UA team of biochemists ...
Jul 18, 2011 |
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Picky females promote survival and diversity, new research says
(PhysOrg.com) -- Picky females play a critical role in the survival and diversity of species, according to a Nature study by researchers from the University of British Columbia and the International Instit ...
Apr 01, 2012 |
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Living longer -- variability in infection-fighting genes can be a boon for male survival
Females of mammals (including humans) tend to outlive males, a circumstance that is usually attributed to males´ more aggressive and hence energy-depleting behaviour, especially when they compete for females. This might ...
May 11, 2012 |
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Discerning males remain faithful
Discerning males remain faithful ... if you are a spider. Sex for male orb web spiders (Argiope bruennichi) is a two shot affair since the act of mating destroys their genitalia. If they survive being eaten ...
Apr 24, 2012 |
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Scientists reveal how females store sperm for decades
(PhysOrg.com) -- Scientists have discovered that all sorts of females – from birds to reptiles to insects – have a nifty trick to prolong the lifespan of sperm, letting them store it for weeks, months ...
Jan 26, 2012 |
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Monogamous birds... peeping on the neighbors!
(PhysOrg.com) -- It is well documented that male birds seduce females using their songs, colourful plumage and courtship dances. These signals reflect male genetic quality and will be graded by the female ...
Jan 27, 2012 |
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Sex-specific behaviors traced to hormone-controlled genes in the brain
Hormones shape our bodies, make us fertile, excite our most basic urges, and as scientists have known for years, they govern the behaviors that separate men from women. But how?
Feb 02, 2012 |
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Female
Female (♀) is the sex of an organism, or a part of an organism, which produces mobile ova (egg cells). The ova are defined as the larger gametes in a heterogamous reproduction system, while the smaller, usually motile gamete, the spermatozoon, is produced by the male. A female individual cannot reproduce sexually without access to the gametes of a male (an exception is parthenogenesis). Some organisms can reproduce both sexually and asexually.
There is no single genetic mechanism behind sex differences in different species and the existence of two sexes seems to have evolved multiple times independently in different evolutionary lineages. Other than the defining difference in the type of gamete produced, differences between males and females in one lineage cannot always be predicted by differences in another. The concept is not limited to animals; egg cells are produced by chytrids, diatoms, water moulds and land plants, among others. In land plants, female and male designate not only the egg- and sperm-producing organisms and structures, but also the structures of the sporophytes that give rise to male and female plants.
For more information about Female, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
