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Tag: "sex" at biology news

Double trouble: Cells with duplicate genomes can trigger tumors

...female. Tetraploid cells contain 44 pairs plus the sex chromosomes. "Our experiments test an idea that's been percolating along among cell biologists for many years but was never really embraced by the cancer community," says Pellman. "We set up this experiment to test it in a real cancer setting." A c...

Bigger brain size matters for intellectual ability

...lab on the brain of Albert Einstein. In a further sex difference, brain size decreased with age in men over the age span of 25 to 80 years, but age hardly affected brain size in women. It is not known what protective factors, which could be genetic, hormonal or environmental, operate in women. It rema...

Rutgers researchers scientifically link dancing ability to mate quality

... fellow William Brown also examined results by the sex of the dancer. They found that symmetric males received better dance scores than symmetric females and that female evaluators rated symmetric men higher than male evaluators rated symmetric men. "In species where fathers invest less than mothers in ...

Same-sex mating by fungi spawned infection outbreak, evidence suggests

..., which began in 1999. Moreover, the evidence that sex played an important role in the pathogen's expansi...etween two less harmful fungal strains of the same sex or "mating type" produced the more virulent form. That strain has now taken hold and appears to be s...

New GM mosquito sexing technique is step towards malaria control, report scientists

...rent sexes quickly. By providing a way to quickly sex mosquitoes, the advance paves the way for pooling ...ling several insect pests when methods for sorting sex are available. "Female mosquitoes are responsible for spreading malaria, and also for damage to cro...

Leading lampreys to slaughter: Pheromone for scourge of Great Lakes identified

... trails. After arriving at the spawning grounds, a sex pheromone -- which was identified by Weiming Li, an earlier doctoral student of Sorensen -- attracts the females to males. After spawning, which takes a few weeks, the adults die. It has taken Sorensen and his colleagues about 15 years to find, is...

Jefferson scientists identify gene defect leading to abnormal skin development and cancer

... trails. After arriving at the spawning grounds, a sex pheromone -- which was identified by Weiming Li, an earlier doctoral student of Sorensen -- attracts the females to males. After spawning, which takes a few weeks, the adults die. It has taken Sorensen and his colleagues about 15 years to find, is...

The brain is broadly wired for reproduction

...le mouse brains. However, there were some telltale sex differences in the circuitry, which offer important new pathways for investigating differences in male and female reproductive physiology and behavior, Buck said. Although it is still early, the researchers suspect that the findings in mice could h...

HIV/AIDS rates in Tijuana, Mexico increasing at alarming rate

...rouwer, adding that high-risk groups ?men who have sex with men, injection drugs users, sex workers and pregnant women ?are of particular concern. The aim of the UCSD study, conducted along w...

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

...issolved oxygen, also known as hypoxia, can induce sex changes in embryonic fish, leading to an overabund...ty of certain genes that control the production of sex hormones and sexual differentiation in embryonic zebra fish. As a result, 75 percent of the fish dev...

'Banana-jawed' fossil mammal linked to rare sound-producing skill

...ws. This meant the trait was possessed by only one sex -- but which one? Previous research, he said, suggested such jaw structures likely were found in females. The researchers then analyzed incisor teeth, located in the front of the jaw and used for biting. In modern hyraxes, males have larger incisors...

Growth hormone is made in the brain, report scientists

...earn differently than females. It is possible that sex differences in these hormones are somehow involved." ...

UCLA scientists find male gene in brain area targeted by Parkinson's

UCLA scientists have discovered that a sex gene responsible for making embryos male and formi...gender and makes embryos male. Located on the male sex chromosome, SRY manufactures a protein that is secreted by cells in the testes. Now, in an unexpect...

First wolverine radio-collared in Pacific Northwest

...lo gulo) weigh about 20 to 40 pounds, depending on sex and age, and are the largest land-based member of the mustelid family that includes weasels, badgers, and otters. They are primarily found in boreal forest and tundra habitats in the far north, but also occur in mountainous terrain at the southern en...

UCSD biologists find new evidence for one-way evolution

... to new questions. "Apparently, plants that have sex exclusively with other plants and not themselves, enjoy a greater evolutionary advantage," Igic said. "Exactly why is unclear," Species capable of rejecting their own pollen in favor of pollen from other individuals, harbor more genetic variation t...

Patients now surviving once-fatal immune disease

... gene on the X-chromosome--one of the two types of sex chromosomes. Males with this disease have very low levels of infection-fighting proteins called antibodies. Treatment includes aggressive use of antibiotics and replacement of the missing antibodies with gamma globulin. "Almost all of the adults wit...

Brain differences could explain why males and females experience pain relief differently

...nd functional differences in the brain may explain sex differences in the experience of pain and in the e...ly in a similar manner in females. In addition to sex differences in how the PAG is organized anatomically, the team went on to show that persistent pain ...

New brain hormone puts brakes on reproduction

... the hormones stimulate production of estradiol, a sex steroid hormone and the body's main form of estrog...mones, establishing feedback that keeps the body's sex hormones on an even keel. Estradiol also works higher in the brain, on the hypothalamus, to ramp do...

It's in the genes: Study opens door to new treatment of the blues

...ain water. A month later, the rodents' interest in sex and sweets had returned, but the social avoidance remained. The researchers found that long-term use of antidepressants, such as fluoxetine (Prozac) and imipramine (Trofanil), were successful in reversing the social withdrawal in these mice. But the...

Insects that produce males from unfertilized eggs reveal a surprising cellular feat

...ts, bees, and wasps--have an unusual mechanism for sex determination: Unfertilized eggs develop into males, while fertilized eggs become females. But the development of an unfertilized egg into an adult (called parthenogenesis) remains a mysterious process. One mystery has been the origin of the centro...

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