To woo a mate, the Albert's lyrebird of Australia first chooses a stage of entangled vines, then in performance he shakes the vines as part of his courtship footwork, synchronizing each shake with the beat of his striking ...
Plants & Animals
Mar 28, 2024
0
177
The Gambia's ban on female genital mutilation (FGM) since 2015 is under threat. Proposed changes before parliament could permit medicalized female genital cutting and allow it for consenting adults.
Social Sciences
Mar 31, 2024
0
43
A blood-sucking nuisance, mosquitoes are responsible for spreading diseases to hundreds of millions of people every year. True?
Plants & Animals
Mar 27, 2024
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1
Public health strategies among young people must address violence against women and risky sexual practices associated with pornography exposure, Queensland University of Technology researchers say in new research.
Social Sciences
Mar 19, 2024
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9
Researchers Toru Miyamoto, Ko Mochizuki, and Atsushi Kawakita of the University of Tokyo have discovered the first species pollinated by sap beetles in the genus Pandanus, a group of palm-like plants native to the tropics ...
Plants & Animals
Mar 27, 2024
0
24
While much ink has been poured over China's economic growth in recent decades, the contributions of Chinese women often receive less attention. With the pressure of the "three-child policy", being a mother isn't a mere personal ...
Social Sciences
Mar 21, 2024
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1
Aedes aegypti mosquitoes, one of the most common species in the U.S., love everything about humans. They love our body heat and odors, which enable them to find us. They love to feed on our blood to make their eggs mature. ...
Plants & Animals
Mar 19, 2024
0
1
As the days grow longer and the air warms up, nature is bursting back to life. Even before their leaves return, trees produce delicate, fuzzy structures known as catkins. These tiny, downy threads, often described as kitten ...
Plants & Animals
Apr 2, 2024
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1
A gene associated with courtship behavior in fruit flies does not operate the same way in two different fruit fly species, a new study finds. The work demonstrates that conserved genes—the same genes found across species—do ...
Plants & Animals
Mar 21, 2024
0
1
From microbes in the human gut to symbiotic algae in coral reefs, research in recent decades has increasingly revealed the pivotal roles that microorganisms (or microbial species) play in shaping the biology of host organisms ...
Evolution
Apr 17, 2024
0
4
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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