News tagged with females

Related topics: offspring , women , proceedings of the royal society b , sperm , eggs

Women in military less likely to drink than civilian women

While it is known that members of the U.S. military overall are more likely to use alcohol, a new study finds that female enlistees and female veterans are actually less likely to drink than their civilian counterparts. This ...

Jul 31, 2014
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Worldwide FGM ban sought at 'Girl Summit' (Update 2)

British Prime Minister David Cameron called on Tuesday for a worldwide ban on female genital mutilation and child marriage as he launched the first UN-backed "Girl Summit" on issues that affect millions around the globe.

Jul 22, 2014
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Fatty liver disease prevented in mice

(Medical Xpress)—Studying mice, researchers have found a way to prevent nonalcoholic fatty liver disease, the most common cause of chronic liver disease worldwide. Blocking a path that delivers dietary ...

Jun 03, 2014
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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.

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