Tag: "males" at biology news

Females may be more susceptible to overindulge 'sweet tooth' cravings than males

...males (35.7 3.1% increase), relative to sedentary males (9.1 2.2% increase). Wheel running decreased intake of the chow plus milk diet in both sexes. In active males, diet-induced hyperphagia was abolished and caloric intake was reduced to that observed during chow feeding. In active female rats, diet-i...

Genes expose secrets of sex on the side

...mosome is migrating more, but if just half as many males are getting their genes into the next generation on average as are females, then it implies more males are migrating to do that." The pattern the researchers see in our genes doesn't...

Human chromosome 5 final sequence analysis released to public

... and birds developed their own methods of creating males and females. One duplicated region on chromosome 5 could eventually help explain how spinal muscular dystrophy is inherited. Researchers had known that deletions in the gene for survival of motor neurons, (SMN) caused the disease, but people with the...

European common frog found to use novel mating strategy

...s, on the border between Spain and France, so many males are vying for fatherhood that they pirate the egg ...aid. "Because of a population excess of males, the males found a system to reproduce without the female." He and colleagues in Spain, Germany and The Netherl...

Sugar-coated sea urchin eggs could have sweet implications for human fertility

...les inject large clouds of eggs into the water and males do the same with sperm. Scientists found that the key to species-specific fertilization is a sperm protein called bindin connecting with the correct receptor in the plasma membrane on the surface of the egg. The sperm have to pass through a jelly-lik...

Recent evolution at a single gene may have brought down heart disease risk in some human groups

...ence of heart disease events among modern European males would have been more than 40% higher than it is had there not been selection for the high-expression variant. The cause of the selection in recent evolution remains a subject for speculation; given its usual occurrence late in life, heart disease its...

Probing the surface of white blood cells to enhance immune system medicine

...yndrome, a hereditary immune disorder that affects males and manifests itself through low platelets and recurrent bacterial infections. These conditions can eventually cause a fatal hemorrhage or infection in these patients. Higgs and his team found no differences in the length or density of microvilli on ...

Two warbler species find the West isn't big enough for both of them

... the birds with taped warbler song and decoys, and males were captured before females were present in the a...xplain why previous studies have shown that hermit males become agitated only when other hermit males are encroaching, while Townsend's males react strongly ...

The insect police: Why social insects punish cheating comrades

...kers do lay unfertilised eggs - which develop into males - essentially "cheating" on the other workers who are investing in only the queen's reproduction. Such action can be severely penalized by other workers - in honeybees, where this behavior was first shown, workers remove worker-laid eggs within hours...

Millennia still mean early days for newly identified sex chromosome

...x-determination system in which females are XX and males are XY. They provide evidence that even though the threespine stickleback Y chromosome is less than ten-million years old, it already has many hallmarks of a typical sex chromosome including poor homology with the X chromosome due to the presence of ...

Circadian clock genes reign in duration of fruit fly copulation

...s copulation normally lasts for around 15 minutes, males carrying mutations in period or timeless spent up ...because mutant female flies copulating with normal males did not show a similar change in behavior. Both the period and timeless genes are evolutionarily co...

Why your knees and quads hurt more after running than walking: You're only human

... Taylor at Harvard University, filmed four healthy males walking and running at six self-selected speeds. They measured vertical force on the ground and velocity as the subjects chose "slow," "preferred" and "fast" speeds for both running and walking. They found that with an increase of speed and gait, th...

Nevada researcher re-ignites mammal reproduction debate

...ld out-reproduce sons in poorer conditions because males that are unsuccessful in having mates have few offspring while most females breed throughout their lifetime." The problem with this idea is that, until now, only about 30-percent of studies have supported the hypothesis, which has been debated becau...

Biologists deciphering complex lemur scent language

...ingtails were particularly interesting because the males have different kinds of scent glands, and they use...ready know from their behavioral observations that males seem to form "scentences," said Drea. "When males mark, they mark either only with the wrist gland, ...

Size does matter when choosing a mate

The difference in size between males and females of the same species is all down to the...found that in larger shorebirds the battle between males for a mate is highly competitive and larger size offers an advantage over other potential suitors as...

Study explains spatial orientation differences between sexes

...d to be larger in men than in women, and may allow males to adjust themselves more accurately than females ...ments. In the study, Tremblay asked 24 people (11 males and 13 females) to point a laser straight-ahead (perpendicular to the body orientation) while uprigh...

Social benefits of wound healing may not make any difference in animals with multiple partners

...amous and non-monogamous deer mice. Non-monogamous males mate with more than one female during a breeding season. The researchers especially wanted to see if social interaction, or the lack of it, made a difference in the rate of wound healing in the non-monogamous mice. It didn't. In fact, levels of...

Wheelchairs biomechanics, prosthetic development

...championship — on the propulsion cycle. Eight males performed three sprints as measured by a wheelchair ergometer. Data suggest that residual torque increases in proportion to the increase in wheel camber. This could explain other study results, which show a decrease in velocity and an increase in pow...

Study: Mothers turn fearless when peptide level drops

...ely attack the males, says Gammie, noting that the males sometimes eat pups and that "the best defense for the mom is the offense." For the study, only the mice that received either no dose or a low dose of the peptide displayed the expected behavior. As the levels of CRH increased, the number of at...

Casanova or caveman: Scientists isolate nerve cells that choreograph male fly's courtship behavior

...mating did occur during the experiment, the mutant males failed to achieve their ultimate goal - reproducti...le thing. We can well assume that, when the mutant males behave in this way, they are doing things that the female does not find attractive." Removing the ne...

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