News tagged with sex
Oral sex linked to cancer risk
US scientists said Sunday there is strong evidence linking oral sex to cancer, and urged more study of how human papillomaviruses may be to blame for a rise in oral cancer among white men.
Feb 20, 2011 |
4.4 / 5 (24) |
14
Young adults' sexual relationships increasingly favor men, research finds
(PhysOrg.com) -- While young women's educational and career opportunities have skyrocketed over the past two decades, their opportunities for stable, long-term relationships have declined, according to new research from sociologists ...
Other Sciences / Social Sciences
Jan 18, 2011 |
4.3 / 5 (18) |
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Extra testosterone reduces your empathy
A new study from Utrecht and Cambridge Universities has for the first time found that an administration of testosterone under the tongue in volunteers negatively affects a person's ability to 'mind read', an indication of ...
Medicine & Health / Medical research
Feb 09, 2011 |
4.6 / 5 (14) |
8
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Adam's rib, revisited: Evolutionary divergence of mammalian sex chromosomes
(Phys.org) -- Males and females... Mars and Venus... XY and XX chromosomes -- all are common memes. At the same time, the evolution of therian (placental and marsupial) sex chromosomes is less widely understood. ...
Apr 18, 2012 |
4 / 5 (14) |
18
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The unstable future of a world full of men
As the global population hits seven billion, experts are warning that skewed gender ratios could fuel the emergence of volatile "bachelor nations" driven by an aggressive competition for brides.
Other Sciences / Social Sciences
Oct 26, 2011 |
5 / 5 (9) |
201
PNAS-published poll finds some Christians find their own political beliefs conflict with Jesus' teachings
(PhysOrg.com) -- A new online poll conducted by a team of three researchers from Stanford University has found that of those who identified themselves as Christians and who also identified themselves as either politically ...
Other Sciences / Social Sciences
Jan 31, 2012 |
4.1 / 5 (11) |
3
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Why coffee protects against diabetes
Coffee, that morning elixir, may give us an early jump-start to the day, but numerous studies have shown that it also may be protective against type 2 diabetes. Yet no one has really understood why.
Medicine & Health / Medical research
Jan 13, 2011 |
4.7 / 5 (9) |
1
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Choices -- not discrimination -- determine success for women scientists, researchers say
It's an incendiary topic in academia – the pervasive belief that women are underrepresented in science, math and engineering fields because they face sex discrimination in the interviewing, hiring, and grant and manuscript ...
Other Sciences / Social Sciences
Feb 07, 2011 |
5 / 5 (8) |
5
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Studies question effectiveness of sex offender laws
Two studies in the latest issue of the Journal of Law and Economics cast doubt on whether sex offender registry and notification laws actually work as intended.
Other Sciences / Social Sciences
Aug 30, 2011 |
5 / 5 (8) |
25
Sex explains why the fit don't always survive
(PhysOrg.com) -- New research from The Australian National University has shown how genetic variation persists through generations, rather than being bred out in an evolution towards a ‘perfect type’.
Nov 22, 2011 |
4.9 / 5 (8) |
12
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Sexual reproduction works thanks to ever-evolving host, parasite relationships: study
(PhysOrg.com) -- It seems we may have parasites to thank for the existence of sex as we know it. Indiana University biologists have found that, although sexual reproduction between two individuals is costly ...
Jul 07, 2011 |
4.8 / 5 (8) |
3
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New report: Don't blame the pill for estrogen in drinking water
Contrary to popular belief, birth control pills account for less than 1 percent of the estrogens found in the nation's drinking water supplies, scientists have concluded in an analysis of studies published on the topic. Their ...
Dec 08, 2010 |
3.8 / 5 (8) |
0
Yes, men really can make it longer: study
Some non-surgical methods for increasing the length of the male sex organ do in fact work, while others are likely to result only in soreness and disappointment, a review of medical literature has shown.
Apr 19, 2011 |
4.7 / 5 (6) |
2
Mitochondria and the great gender divide
(Medical Xpress) -- Why are there two sexes? It’s a question that has long perplexed generations of scientists, but researchers from UCL have come up with a radical new answer: mitochondria.
Dec 09, 2011 |
4.3 / 5 (6) |
0
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Sex-specific behaviors traced to hormone-controlled genes in the brain
Hormones shape our bodies, make us fertile, excite our most basic urges, and as scientists have known for years, they govern the behaviors that separate men from women. But how?
Feb 02, 2012 |
5 / 5 (5) |
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Sex
In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.
An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
For more information about Sex, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
