Tag: "female" at biology news
Different but equal: Settling the dosage compensation debate
...mans, male cells have a single X chromosome, while female
cells have two. Researchers have long debated over how X and autosomal chromosome 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...
Rhythm gene discovered
...C. elegans worms are hermaphrodites both male and female
and make their own sperm and eggs. Rhythmic contractions control how the eggs are pushed down the tube-like gonadal sheath and into the spermatheca, which contains sperm. When vav-1 is disabled, the worms "have almost no progeny," Maricq says. "T...
Satellite technology allows scientists to track warm sharks in cold polar seas
...spawn. From 2002 to 2004, the scientists tagged 51 female
salmon sharks. For comparison, co-author David Holts, a biologist with NMFS, led the researchers to the Southern California coast, where 31 blue sharks were outfitted with SPOT and PAT tags. During the three-year study, the scientists obtained tracki...
Egg's energy stores key to preserving fertility
...partment of pharmacology and cancer biology. Also, female
mice missing the gene to produce caspase-2 are born with an excess number of oocytes. "We've really demonstrated that caspase-2 is the thing required for oocyte death, and provided a specific molecular mechanism that can keep it shut off," Margolis s...
New GM mosquito sexing technique is step towards malaria control, report scientists
...odified mosquitoes were mixed with normal male and female
mosquitoes, they found the females were as likely to breed with the modified mosquitoes as they were with the normal ones. This work builds on earlier work by the Imperial team published in 2000, demonstrating for the first time the insertion of a fo...
Brain regulates initial stages of sex change in social fish
ATLANTA - While changing sex from female
to male, the highly social bluebanded goby becomes...he dominant male typically results in the dominant female
changing sex to fill the void. During this process, the female
experiences an array of behavioral ch...
Sperm trading can resolve hermaphrodite mating conflicts
...phroditic species. For example, combining male and female
gender in one and the same individual, hermaphrodites have been predicted to frequently be at conflict (theoretically speaking) about which sexual roles to play, because matings are often more costly, in terms of evolutionary fitness, to one gender t...
The meiotic histone code
...ough cytological analysis of the resulting sterile female
oocytes, determined that this histone kinase is necessary for disassembly of the synaptonemal complex, condensin loading, and the further acetylation of histones H3 and H4. This work provides novel evidence of the importance of histone modifications ...
NHGRI's large-scale sequencing research network sets its sights on disease targets
... are called X and Y, determine whether a person is female
(XX) or male (XY). Any defects in genes on the X chromosome are often more apparent in males than females because the Y chromosome does not carry corresponding genes to compensate. While researchers have identified the genes responsible...
When do mosquitoes prefer a blood banquet, or a sugar feast? Three genes make the call
... have isolated three key genes that determine when female
mosquitoes feed on blood and when they decide to s...ceedings of the National Academy of Sciences. Only female
mosquitoes draw blood, and only females survive the winter. Proteins in the blood they suck from hum...
UW study shows deer in CWD zone stick to home
...past two-and-one-half years. "Adult does and their female
fawns establish home ranges in the same location where they were born and stay there for their entire life," Mathews explains. "Once young bucks have dispersed, they too establish small home ranges and rarely leave them, even during the rut. Deer a...
In Western bluebird as well as human families, accumulated wealth encourages stability
...n only sympathize with the Western bluebird. While female
fledglings fly off on their own in late summer, their brothers typically hang around through the winter and into the next breeding season, living off the bounty of their parents' larder. As with humans, though, as the money runs low, the kids split, ...
Scientists unpick genetics of first 15 minutes of life
...into a tight ball that could not interact with its female
counterpart, the egg pro-nucleus. This showed that...the egg cell so that it can properly join with the female
pronucleus to form a new genetically complete the beginning of a new life. "A slight mutation in the...
Picky female frogs drive evolution of new species in less than 8,000 years
Berkeley -- Picky female
frogs in a tiny rainforest outpost of Australia ha...t this should create evolutionary pressure for the female
choice to evolve so that they pick the right males," Moritz said. This so-called reinforcement has b...
Every squeak you make
...31, 2005 -- Scientists have known for decades that female
lab mice or their pheromones cause male lab mice t... the response evoked in the male mouse's brain by female
mouse pheromones. Pheromones are chemical signals emitted by many different species that are frequen...
ECCO 13 - One voice, one vision needed to overcome cancer in Europe
...act they have one of the highest incident rates of female
breast and ovarian cancer in the EU. The lowest female
cancer incident rate was in Cyprus and Greece. 5% of Europe's total healthcare expenditure is alloca...
Vaginal gel may provide a new approach to HIV prevention
Research with female
monkeys at the Tulane National Primate Research Center has for the first time shown that three different anti-viral agents in a vaginal gel protect the animals against an HIV-like virus. The research suggests that a microbicide using compounds that i...
Mice have a gift for song
.... The authors used cotton swabs coated with either female
mouse urine, male mouse urine, or a combination of the two to elicit the male mouse's ultrasonic sounds, and then recorded their vocal responses. Far from random patter, male ultrasonic calls contain complex passages with long sequences composed of d...
ECCO 13 explores issues in cancer patient management
... meeting cancer sufferers' preferences for male or female
healthcare providers. It is well known that women show a strong preference for female
physicians, especially during pelvic exams, yet the attitudes and preferences of male cancer suffere...
ECCO 13 offers new insights into patients' perceptions of cancer
...rnative approaches were more likely to be younger, female
and educated to a higher level. 45% of CAM users since diagnosis had breast cancer, compared with only 17% of non-CAM users. In terms of the actual pattern and type of CAM use reported by patients, this was found to vary considerably. This study is ...
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