News tagged with females
The mammalian placenta is more than just a filter through which nutrition and oxygen are passed from a mother to her unborn child. According to a new study by a research group from the University of Pennsylvania School of ...
Medical research Mar 04, 2013 | 4 / 5 (1) | 0 |
Early life exposure to normal bacteria of the GI tract (gut microbes) protects against autoimmune disease in mice, according to research published on-line in the January 17 edition of Science. The study ...
Immunology Jan 17, 2013 | 5 / 5 (1) | 0 |
(Medical Xpress)—A bird listening to birdsong may experience some of the same emotions as a human listening to music, suggests a new study on white-throated sparrows, published in Frontiers of Evolutionary Ne ...
Neuroscience Dec 27, 2012 | 5 / 5 (4) | 11 |
Striking new evidence suggesting that diet and related factors early in life can boost the risk for breast cancer—totally independent of the body's production of the hormone estrogen—has been uncovered by a team of researchers ...
Cancer Sep 17, 2012 | not rated yet | 0 |
In a discovery that could help in the identification and treatment of anxiety disorders, Michigan State University scientists say the brains of anxious girls work much harder than those of boys.
Psychology & Psychiatry Jun 05, 2012 | 1.5 / 5 (2) | 1 |
An intriguing clue to longevity lurks in the sexual maturation timetable of female mammals, Jackson Laboratory researchers and their collaborators report.
Genetics May 07, 2012 | not rated yet | 0 |
Scientists at the Universities of Birmingham and Warwick have shed new light on how sperm navigate the female reproductive tract, 'crawling' along the channel walls and swimming around corners; with frequent collisions.
Medical research May 07, 2012 | 4.8 / 5 (5) | 1 |
For the first time, Massachusetts General Hospital (MGH) researchers have isolated egg-producing stem cells from the ovaries of reproductive age women and shown these cells can produce what appear to be normal egg cells or ...
Medical research Feb 26, 2012 | 5 / 5 (4) | 1 |
In a study published today in the journal Nature Genetics, a group of scientists including UNC biologist Jason Lieb, PhD, present experiments supporting a longstanding hypothesis that explains how males can survive with o ...
Genetics Oct 24, 2011 | 5 / 5 (2) | 1 |
A surprisingly large number of women 18 or older choose to delay or skip monthly menstruation by deviating from the instructions of birth-control pills and other hormonal contraceptives, a team of University of Oregon researchers ...
Health May 09, 2013 | 5 / 5 (1) | 0 |
(Medical Xpress)—Researchers at LWL-University Hospital in Bochum, Germany have found that male volunteers looking at photographs of human eyes were better at guessing the "mood" of the person in the picture, ...
Psychology & Psychiatry Apr 15, 2013 | 5 / 5 (1) | 1 |
Monash Institute of Medical Research scientists have found a protein in the female reproductive tract that protects against sexually transmitted diseases (STIs) such as chlamydia and herpes simplex virus ...
Diseases, Conditions, Syndromes Feb 28, 2013 | not rated yet | 0 |
Male rat pups have more of a specific brain protein associated with language development than females, according to a study published February 20 in The Journal of Neuroscience. The study also found sex differences in the ...
Neuroscience Feb 19, 2013 | 5 / 5 (1) | 0 |
Plastic products and jet fuel exposures raising incidences of 'epigenetic transgenerational inheritance'
Washington State University researchers have lengthened their list of environmental toxicants that can negatively affect as many as three generations of an exposed animal's offspring.
Genetics Jan 24, 2013 | 5 / 5 (2) | 0 |
Female mice exposed to Bisphenol A through their mother's diet during gestation and lactation were found to be hyperactive, exhibit spontaneous activity and had leaner body mass than those not exposed to the chemical, researchers ...
Medical research Jan 24, 2013 | not rated yet | 0 |
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.
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