In many social species, including humans, even if large group sizes provide competitive advantages over smaller neighboring groups, the preponderant role of adult males in territoriality has often been put forward, most likely ...
Plants & Animals
May 27, 2020
0
56
The ability to recognize relatives can make life more dangerous for the female of the species, new research carried out at the University of St Andrews, the Institute for Advanced Study in Toulouse and the University of Valencia ...
Plants & Animals
May 26, 2020
0
24
Samuel Hulse, a Ph.D. candidate at UMBC, spent a lot of time in waders over the last two years. He traipsed from stream to stream across the eastern U.S., carefully collecting live specimens of small, colorful freshwater ...
Evolution
May 22, 2020
0
13
The inconsistent sexual signals of male treefrogs have made it more difficult for females to find a quality mate, according to a new study by a researcher at The University of Western Australia.
Plants & Animals
May 18, 2020
0
16
The largest collection of footprints from the human fossil record in Africa is described in Scientific Reports this week. The findings, which further our understanding of human life during the Late Pleistocene period (126,000 ...
Archaeology & Fossils
May 14, 2020
0
500
A modification that creates more male offspring was able to eliminate populations of malaria mosquitoes in lab experiments.
Plants & Animals
May 12, 2020
3
436
Scientists worldwide have long debated our ability to identify male and female dinosaurs. Now, research led by Queen Mary University of London has shown that despite previous claims of success, it's very difficult to spot ...
Plants & Animals
May 12, 2020
1
1038
Artificial insemination (AI), breeding value estimation, and genomic selection have allowed substantial increases in milk and component yields for Holstein cows. However, their widespread use has also led to challenges including ...
Plants & Animals
May 11, 2020
0
5
In many fish species body size plays an important role in sexual selection. Large individuals are preferred mating partners because they can enhance offspring survival by providing better quality resources than small individuals. ...
Plants & Animals
May 08, 2020
0
49
The ancient cemetery of Mözs-Icsei dűlő in present-day Hungary holds clues to a unique community formation during the beginnings of Europe's Migration Period, according to a study published April 29, 2020 in the open-access ...
Archaeology & Fossils
Apr 29, 2020
0
776
Male (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually.
Not all species share a common sex-determination system. In humans and most animals, sex is determined genetically but in other species it can be determined due to social, environmental, or other factors. The existence of two sexes seems to have been selected independently across different evolutionary lineages (see Convergent Evolution). Accordingly, sex is defined operationally across species by the type of gametes produced (ie: spermatozoa vs. ova) and differences between males and females in one lineage are not always predictive of differences in another.
Male/Female dimorphism between organisms or reproductive organs of different sexes is not limited to animals; male gametes are produced by chytrids, diatoms and land plants, among others. In land plants, female and male designate not only the female and male gamete-producing organisms and structures but also the structures of the sporophytes that give rise to male and female plants.
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