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Tag: "sexes" at biology news

Study shows lizard moms dress their children for success

...ced progeny types--yellow-throated lizards of both sexes with barred backs, orange-throated males with striped backs, and blue-throated females with striped backs. "The frequencies of yellow and orange were both increasing in the wild that year, so the females exposed to orange neighbors and yellow sire...

CU study reveals why starling females cheat

...ggests that there may be less conflict between the sexes than in other species. He is currently researching this issue. While it has long been known that males of many species cheat and mate widely to produce as many offspring as possible to spread their genes, the reasons behind female infidelity appea...

20-year study shows significant rise in childhood obesity, especially among girls

...an 30 in 2002, compared with one per cent for both sexes in 1982. Nearly a third of ten year-old girls (30 per cent) and a fifth of ten year-old boys (21 per cent) had a BMI of more than 25 in 2002, compared with 14 per cent of girls and eight per cent of boys in 1982. Five per cent of the ten-...

Vanishing beetle horns have surprise function

...hin sexually dimorphic horned beetle species, both sexes initially form the horns, even if one or both sexes reabsorb the horn tissue sometime before adulthood. In the American Naturalist report, Moczek ex...

A new male-specific gene in algae unveils an origin of male and female

...he familiar notion of the separate male and female sexes exhibited by animal and plant species is based in part on the anatomically and genetically distinct gametes, sperm and egg, produced by members of each sex. But the evolutionary origin of oogamy—reproduction though joining of distinct sperm and egg c...

Blue eyes -- A clue to paternity

... second study, a group of 443 young adults of both sexes and different eye colors were asked to report the eye color of their romantic partners. Blue-eyed men were the group with the largest proportion of partners of the same eye color. According to Bruno Laeng and colleagues, "It is remarkable that bl...

Study defines effective microbicide design for HIV/AIDS prevention

... cultural and socioeconomic inequities between the sexes also can leave women more susceptible. "In many cases, women lack control over their abilities to protect themselves against the virus," Katz said. "Microbicide development is a response to the demonstrated need for new female-controlled methods fo...

Do angry men get noticed?

...ore attuned to socially relevant expressions, both sexes prioritize the detection of angry male faces; in short, angry men get noticed. The advantage for detecting angry male faces is consistent with the notion that human perceptual processes have been shaped by evolutionary pressures arising from the soci...

Zebra finch males prefer females with exaggerated maternal traits

...raits and strong morphological differences between sexes ?phenomena seen frequently in birds and other animals. The findings are reported by Carel ten Cate, Machteld Verzijden and Eric Etman of Leiden University, and appear in the June 6th issue of Current Biology. In most bird species, young individuals...

UCLA study finds same genes act differently in males and females

...We previously had no good understanding of why the sexes vary in their relationship to different diseases," explained Xia Yang, Ph.D., first author and postdoctoral fellow in cardiology at the David Geffen School of Medicine at UCLA. "Our study discovered a genetic disparity that may explain why males and...

Wild meerkats school their young

... (meerkats older than 90 days) and parents of both sexes aid in rearing the young. Pups (meerkats younger than 90 days of age) are initially incapable of finding their own prey and therefore rely on provisions from other members of the group by responding to their begging calls for food. Meerkats typi...

New research examines genetics of successful aging

...lated physiological changes that occur between the sexes over the life span," said Dr. Zubenko. "It would not be surprising if the collection of genes that influences the capacity to reach old age with normal mental capacity differs somewhat for men and women." The majority of the successful aging or "SAG"...

Internal body clock dictates timing of different types of stroke

... types, but there was little variation between the sexes in respect of the timing of the various types of stroke. All three stroke types registered two peaks during the day, one between 6 and 8 in the morning and the other between 6 and 8 in the evening, with a significant dip in the numbers of strokes o...

Men and women differ in brain use during same tasks

...involve gender specific focuses to ensure that the sexes are studied separately, which he believes has not been done before. "The larger implications of this work, as well as other work pointing in the same direction, is that we may increasingly find out that there are differences in the 'hard wiring' of...

New research examines genetics of successful aging

...lated physiological changes that occur between the sexes over the life span," said Dr. Zubenko. "It would not be surprising if the collection of genes that influences the capacity to reach old age with normal mental capacity differs somewhat for men and women." The results of the study also highlighted ...

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

...advance that allows them to separate the different sexes quickly. By providing a way to quickly sex mosqui...le to identify and separate the different mosquito sexes much more easily than by manually sorting. Professor Andrea Crisanti, senior author of the paper, f...

Prenatal exposure to marine toxin causes lasting damage

...g in particular maze tests. Exposed rats of both sexes also showed greater susceptibility to a chemical that induces amnesia by compromising particular brain receptors, suggesting that the animals had less functional reserve with which to solve memory tasks, the researchers said. "Brief, low-dose domoi...

Men Estimate Men's Risks Of Common Disorders Higher Than Women Do, And Vice Versa

... cent of males. Cancer: around two thirds of both sexes said they believed men and women were 'equally likely' to experience cancer; 12 per cent of males compared to 3 per cent of females said that men were more likely to have cancer, and 30 per cent of females compared with 24 per cent of males said that...

The evolutionary triumph of flower power

...it. The second study involved 122 subjects of both sexes in an elevator. When a person entered, he or she either received a flower, a pen or nothing at all. Again, flowers were the emotional winner with recipients smiling, chatting and standing closer together. In the last study, florists delivered bouque...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...chromosome -- present in at least one copy in both sexes -- encodes more than 1,000. More than 45 years ag...X chromosome, Willard said, in order to leave both sexes with the same activity level, or dosage, of the genes encoded by the X chromosome. Scientists had al...

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