News tagged with females
Related topics: offspring , women , proceedings of the royal society b , sperm , eggs
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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(HealthDay)—Increased loading of the lumbar spine, arising from lifestyle activities (such as lifting heavy objects, more frequent pregnancy, and higher body mass index), could contribute to the degenerative ...
Diseases, Conditions, Syndromes May 16, 2013 | 3 / 5 (1) | 0
Twenty percent of American males and 10 percent of American females will experience a kidney stone at some point in their lifetime. Often, these patients will be advised to drink more fluids as a way to prevent future stone ...
Health May 15, 2013 | not rated yet | 0
(Medical Xpress)—Are high school age students who show aggression toward their peers more likely to consume alcohol, tobacco and marijuana? A new study of Latino adolescents in Kansas City, Mo., confirms this idea. But ...
Psychology & Psychiatry May 14, 2013 | not rated yet | 1
(HealthDay)—Close to half of U.S high school students text while driving, a habit that dramatically increases their risk of getting into a potentially fatal car crash, a new study shows.
Pediatrics May 13, 2013 | not rated yet | 0
Women admitted to psychiatry wards experience high levels of violence and sexual assaults, according to a report released this week by the Victorian Mental Illness Alliance Council.
Health May 17, 2013 | not rated yet | 0
What is the reason for the widely reported fact that men are more likely than women to die of cancer? New evidence from population studies suggests that free testosterone could be a key driver of cancer aggressiveness in ...
Cancer May 14, 2013 | 5 / 5 (1) | 0