If you work in medicine, does it matter if you are called by your title? Is it all right if patients, colleagues, and others call you by your first name?
Social Sciences
Dec 05, 2019
0
6
Once a bully, always a bully?
Plants & Animals
Dec 02, 2019
0
6
Scientists have discovered the world's oldest "comma" shrimp, a tiny crustacean shaped like its punctuation namesake.
Plants & Animals
Nov 27, 2019
0
2035
For a certain population subset, socioeconomic status in the United States is harder to change now than at any point in recent history, according to research from the University of Pennsylvania, Princeton University, and ...
Social Sciences
Nov 26, 2019
0
49
When they share habitat, orangethroat and rainbow darters tend to avoid one another, even though they are closely related and can produce "hybrid" offspring. The males compete with males of their own species and will almost ...
Evolution
Nov 25, 2019
0
239
Gonzalo Saco from the Bioenergy and Motion Analysis Laboratory at the Centro Nacional de Investigación sobre la Evolución Humana (CENIEH) has recently published a paper in the journal Forensic Science International on new ...
Other
Nov 22, 2019
0
2
An enzyme that makes the male sex hormones has unravelled a fresh clue about how snail shells come to be curly.
Plants & Animals
Nov 20, 2019
0
46
Leadership during cooperation runs in the family for tiny fish called Trinidadian guppies, new research shows.
Plants & Animals
Nov 20, 2019
0
131
For the little brown bat—a small mouse-eared bat with glossy brown fur—a warm, dry place to roost is essential to the species' survival. Reproductive females huddle their small furry bodies together to save thermal energy ...
Ecology
Nov 19, 2019
0
3
In species with sexual reproduction, no two individuals are alike, and scientists have long struggled to understand why there is so much genetic variation. In a new study published in Nature Ecology & Evolution, a team of ...
Evolution
Nov 18, 2019
0
15
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.
This text uses material from Wikipedia, licensed under CC BY-SA
