Study in Royal Society journals presents evidence for inherited factors in homosexuality
...al that in species occupying closed habitats, both sexes are ornamented and males are more conspicuously coloured than females. In contrast, species occupying open habitats tend to be less ornamented and males tend to be conspicuously coloured only on body regions that can be concealed from predators. Nat...Study: Inadequate physical activity worsens as teenagers become adults
...n that all major racial and ethnic groups and both sexes get too little physical activity, and black and Hispanic girls face the greatest risk of being significantly overweight or obese and inactive." In the new research, she and colleagues wanted to concentrate on possible changes in physical activi...Study in Royal Society journal on first evidence for magnetic field detection in sharks
...between the sexes, or from constraints forcing the sexes to pay attention to different traits. Contact: Dr Ulrika Candolin Group-beneficial traits, frequency-dependent selection and genotypic diversity: an antibiotic resistance paradigm by Dr LA Dugatkin, Dr M Perlin, Dr J Scott Lucas and Dr R Atlas How ...Sexual cooperation: Mating increases longevity in ant queens
...suggest that in some social insects--in which both sexes ultimately benefit from long, successful reproduct... the conflict between mating partners because both sexes benefit from the queen experiencing a long reproductive phase after the colony reaches sexual maturi...Men and women: The differences are in the genes
...tors for explaining normal differences between the sexes but also gender differences in how certain diseases are manifested, progress and respond to treatment. Further studies will be required to establish such a role for these genes."...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 ago...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...Alcoholism reduces male heart's ability to synthesize protein; possible therapy target?
...eport in the journal "Chest" in the U.S., "in both sexes and all races, long-term heavy alcohol consumption (of any beverage type) is the leading cause of a nonischemic, dilated cardiomyopathy" or ACM. A study in an NIAAA publication reports that the amount of alcohol necessary to produce the kind of struc...PNAS highlights for the week of May 9 - 13
...The researchers examined how this dispersal of the sexes affects the gene pool of the different populations. They studied mitochondrial DNA and genes from the Y chromosome, sex-specific tracers of females and males, respectively, from three matrilocal and three patrilocal populations. The analysis provided...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 bouquet...Geneticists identify 'master switch' that causes female flies to behave like males
... he adds. ''Sense organs that look the same in two sexes may be fundamentally different at a molecular level.'' In the Nature study, researchers pinpointed two instances in which the fruitless gene allowed male flies to detect smells that influenced their sexual behavior. Normally, while an inexperienced m...Study in Royal Society journal on world's only horned rodent
...ticipate. Our results suggest a battle between the sexes over the ideal number of mating partners. Contact: Dr C Smith, University of Leicester, University Road, LEICESTER, LE1 7RH Geographical variation in sound production in the anemonefish Amphiprion akallopisos by Dr ES Parmentier, Dr JP Lagardere, Pr...Secret sex life of killer fungus
...posed of nearly equal proportions of two different sexes or 'mating types', which in theory could have sex with each other. Further investigations, in Europe and America, showed that genes had been, or were being, exchanged between individuals of the fungus and that some key genes involved with detecting a...Environment and genetic influences play different roles in boys' and girls' gender-role behavior
...hat underlies the substantial variation within the sexes in terms of the extent to which boys and girls adopt masculine-typical or feminine-typical behaviors. To reach their conclusions, the researchers used information from the Twin's Early Development Study, a longitudinal study that comprises a represe...A double punch for female survival
Achieving equality between the sexes can be a challenge even for single cells. Since evolution began removing bits of male DNA to create the "Y" chromosome, males have had a single copy of certain key genes on the X chromosome, whereas females have two. Normally this would lead females ...Prenatal exposure to marine toxin causes lasting damage
...ng 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 domoic...University of Chicago researchers find human brain still evolving
...rain is 3 to 4 percent larger than a woman's, both sexes score similarly on IQ tests. Lahn also points out that "brain size is very heritable. Bad nutrition is typically not a factor; the brain is very privileged within the body." The researchers emphasize that very little is known about the impact of thes...Study in Royal Society journal on possiblity of human organ regeneration
...ecent evolutionary theory advocates that different sexes may evolve to affect ageing in each other in a way that is beneficial for members of one sex. Here we use experimental evolution to show that males evolve to slow down ageing in their mates when increased female lifespan is beneficial to males. Thus,...Different but equal: Settling the dosage compensation debate
...hromosome gene expression is equalized between the sexes (generally regarding two different models, known as the activation model and the inverse model). These two papers provide the first definitive in vivo evidence in favor of the activation model of dosage compensation in flies. The male-specific-lethal...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 mosquit...le to identify and separate the different mosquito sexes much more easily than by manually sorting. Professor Andrea Crisanti, senior author of the paper, fr......eding season. The learned call is produced by both sexes throughout the year and is believed to serve a variety of functions such as raising mild alarm, maintaining contact between mates and co-ordinating flock activities. They even go through stages of learning this "language," which explains why juvenile...