Tag: "sexes" at biology news
Toy choice among boys, girls a matter of monkey business
...ain aspects of objects that appeal to the specific sexes
and that these aspects may relate to traditional male and female functions dating back to the dawn of the species. She says the toys preferred by boys the ball and the car are described as objects with the ability to be used actively and be propell...
Estrogen linked to more efficient regulation of a woman's heartbeat
... sides of the issue. There is a similarity in the sexes
regarding the mean and standard deviation of the R...hether confusing findings in heart activity of the sexes
could be attributed to the nonlinear characteristics of pacemaker activity, which may cause large va...
Rockefeller researchers provide the first functional evidence for mammalian pheromone receptors
...t the mutants are better at distinguishing between sexes
without prior experience, or that their sexual drive overall is reduced. The fourth behavioral test analyzed sexual behavior of males toward females, which is also dependent on a functioning VNO. Compared to their normal counterparts, the mutant ma...
Cloning pigs and drug discovery among 'hot' topics
...(IXA), commented that when "knockout" pigs of both sexes
are generated that are viable and normal, and survival of grafts extend beyond the current barrier of six to 12 weeks, "human clinical trials would be justified." Added Dr. Cooper, immediate past president of IXA, a section of The Transplantation Soc...
Men are faster than women. but does that mean bets should always be placed on colts?
...hletic and sedentary. The differences between the sexes
that underlie men's athletic advantage include bod...esearch hypothesized that a difference between the sexes
would occur in horses but not dogs. Methodology Data on horse and dog running speeds were obtai...
A mane is a pain, but worth it for male lions
...ear attractive to females. To find out how the two sexes
responded to different types of manes, West, working in Serengeti National Park, set up pairs of realistic-looking dummy lions about 200 meters from adult lions. To test reactions to different mane length, she paired dummies with short blond or long ...
Anti-inflammatory drug reduces growth of cancerous tumors In rats
...estored after receiving indomethacin. Rats of both sexes
that got indomethacin also exhibited behavior suggesting abdominal discomfort was relieved. ...
Sex genes of fish disrupted by common household products
... be all male, or all female, or are partially both sexes
in their genitalia. Historically scientists have suspected actual estrogens or chemicals that mimic estrogens in pollution as the causes of the gender bending effects on fish. Estrogen (or estrogen-like) molecules dock onto a structure called an est...
Men die young, even when they're old
...ath, such as accidents, the difference between the sexes
is greatest for young adults. But the second largest disparity between men and women in the US occurs when they reach their sixties. At that point in their life, men are 1.68 times as likely to die as women, mainly due to disease. The gender gap has...
Battle of the sexes leads to a biological arms race
...rms earlier beliefs: an evolutionary battle of the sexes
can lead to a biological arms race between males a...nderlying conflicts will often remain hidden. Both sexes
may be running frantically, in an evolutionary sense, but their interactions may remain at a standst...
Battle of the sexes leads to evolutionary arms race
...conflict is, in theory, an "arms race" between the sexes
whereby male persistence is matched by female resi...ng conflicts often remain hidden. Thus, while both sexes
may be frantically battling in an evolutionary sense, their match essentially remains at a standstil...
Gender and differing rates of brain activity influence the level of reading and language skills for boys and girls
... rates for specific sub-skills may differ, but the sexes
by grade 3 have neural networks that support each mastering reading....
Research team unlocks secrets of the firefly flash
...and female flash patterns also differ, but in both sexes
flashes are generated by a light-producing abdominal lantern. "How do they do that?" is a frequent question asked by firefly watchers young and old. The firefly lantern contains thousands of specialized cells known as photocytes. In flashing firefli...
Male and female songbirds show big learning differences
...nt. "It's the largest learning difference between sexes
ever found," said Yamaguchi. Small sex-based differences in learning have been found in other animals, but these are usually so small that they are overwhelmed by individual variation. Northern cardinals are unusual among temperate-zone birds becaus...
Study looks at causes, consequences of sex differences
...ng of the basic biological differences between the sexes
and use both sexes
in medical studies when appropriate, says Dr. John Vandenbergh, professor of zoology at North Caroli...
Monogamy appears to be unnatural in the natural world
...many temptations." The authors contend that the sexes
engage in infidelity for different reasons and that evidence for monogamy in human history is sketchy. Males tend to be opportunistic and have sex out of marriage because it is available and pleasurable. For women it is a way of obtaining something b...
Analysis of flight performance in wandering albatrosses yields insights into foraging patterns of different ages and sexes
...rences influence where birds of different ages and sexes
forage for food in the open sea. Few studies of fl...exual dimorphism in birds--differences between the sexes
in size and appearance--is usually studied in relation to breeding behavior, but in wandering albatr...
Scientists find gene that fuels 'sexual arms race'
...imorphism - the diagnostic differences between the sexes
- has been found and characterized. The discovery,... females. However, the same gene functions in both sexes
in other fly species where male-specific pigmentation is absent and males and females look pretty mu...
Mum versus Dad
...et 202-452-1178 New Scientist The battle of the sexes
rages in the most unexpected places. Mothers' and ...is doesn't mean the theory about the battle of the sexes
is wrong," says Jirtle. "It just changes the battlefield." Possums can bear up to 50 babies, but mot...
University of Pittsburgh-led team finds biological reason for women's increased risk of smoking-related lung cancer
...d GRPR mRNA. The difference between the sexes
is related to the location of the GRPR gene on the X chromosome, according to the investigators. Women have two X chromosomes, whereas men have one copy. Normally in a woman, genes are inactivated on one of the X chromosomes. However, both copies ...
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