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Tag: "evolve" at biology news

Columbine flowers develop long nectar spurs in response to pollinators

... more one-sided fashion in many plants: the plants evolve nectar spurs to match the tongue-lengths of the pollinators. Then the process stops, and only starts again when there is a change in pollinators. Whittall and Hodges proved this idea by testing the columbine genus Aquilegia, which is pollinated by...

Physicist cracks women's random but always lucky choice of X chromosome

...r to the usual idea that the biological mechanisms evolve in ways that allow a "best" choice to be made between things rather than a random one. Now researchers led by University of Warwick physicist Dr Mario Nicodemi have explained how this randomness occurs and why that it is beneficial. This will help...

Reconstructing the biology of extinct species: A new approach

... moving about the world, its organ of balance must evolve accordingly," Walker explains. From the visual information, the animal tracks its position relative to stationary objects such as tree trunks, branches, rocks or cliffs, or the ground. Having a stable image of the environment is especially crucial ...

Revealed -- Mosquito genes that could be controlling the spread of killer viruses

...mosquito’s immune system, and discovered that they evolve much faster than the rest of the genes in the geno...t the immune systems of insects are not static but evolve and differentiate rapidly, most likely in response to the different pathogens which each insect spec...

Amphibians in losing race with environmental change

Even though they had the ability to evolve and survive for hundreds of millions of years - si...der way. Many other species will also be unable to evolve fast enough to deal with these changes. Because of their unique characteristics, the amphibians are ...

Invasion of the island bats

...ecies from large continents arrive and, over time, evolve into new species in geographic seclusion. Since islands have many times fewer species than the continent, it seemed only logical that continents were rich sources from which islands drew only a small sample. Once isolated and with fewer species aro...

Genome of yellow fever/dengue fever mosquito sequenced

...evolve with the rest of the genome" said Tu. "They evolve different relationships with the genome. Some are genetic parasites; they appear to do nothing except replicate within the genome. Others are used by the host -- the individual organism's genetic machinery --to perform biological functions." TEs ...

MIT's ocean model captures diversity of underwater forests

...t is consistent with the way real-world ecosystems evolve according to the principles of natural selection. Scientists use models such as this one to better understand the oceans' biological and chemical cycles and their role in regulating atmospheric carbon dioxide, an important greenhouse gas. The...

Study suggests some drug resistance to influenza B medications

... with high-level resistance.? “Influenza viruses evolve rapidly and nimbly, which compels ongoing investigation of antiviral therapies that use alternative mechanisms of action and target different points in the viral life cycle. The emergence of drug-resistant influenza B should draw attention to the imp...

Scientists find genes involved in the battle between Hessian flies and wheat

...but the Hessian fly larvae that survive eventually evolve methods to overcome plant defenses. Purdue University and USDA-Agriculture Research Service scientists trying to thwart the insect have identified Hessian fly genes that nullify toxins that wheat produces to protect itself from the munching larvae. ...

Bacterial walls come tumbling down

...ich are in constant demand as microbes continually evolve new ways to evade the drugs that researchers design to thwart them. The time it takes for bacteria to develop resistance to new antibiotics has been as short as one year for penicillin V and as long as 30 years for vancomycin. Researchers attempti...

Analysis of rhesus monkey genome uncovers genetic differences with humans, chimps

...at having an extra copy of a gene may enable it to evolve more rapidly and that small duplications are a key feature of primate evolution. The analysis also revealed a few instances in which whole families of genes were radically different in the rhesus, containing more copies of certain genes than in t...

RNA enzyme structure offers a glimpse into the origins of life

...rwinian natural selection, and the molecules would evolve into bigger and better ribozymes. That's what make...or the desired properties, researchers are able to evolve RNA enzymes from scratch. In the Ellington lab, Robertson evolved the ligase ribozyme (called the L1...

40,000-year-old skull shows both modern human and Neandertal traits

Humans continued to evolve significantly long after they were established in Europe, and interbred with Neandertals as they settled across the continent, according to new research published this week in the Proceedings of the National Academy of Sciences (PNAS) USA. Professor...

Birth rate, competition are major players in hominid extinctions

...l. The beneficial environment allowed primates to evolve as relatively brainy animals that reproduce slowly. However, when climate changed so that tropical forests shrunk and the environment became patchy, many species including primate species became extinct. "While past primate populations moved with...

No sex for 40 million years? No problem

...ion years of existence has nevertheless managed to evolve into distinct species, says new research published...vides scientists with new insight into why species evolve in the first place. The research, published in PLoS Biology, focuses on the study of bdelloid roti...

Will the plague pathogen become resistant to antibiotics?

...f MDR in the causative agent of plague may rapidly evolve naturally, and present a vital biomedical, public health, and biodefense threat." ...

Making mice with enhanced color vision

...es. They did not require additional generations to evolve new sight." Retinas of primates such as humans and monkeys are unique among mammals in that they have three visual receptors that absorb short (blue), medium (green) and long (red) wavelengths of light. Mice, like other mammals, only have two; one...

2,000 influenza virus genomes now completed and publicly accessible

...l help scientists understand how influenza viruses evolve and spread," says NIH Director Elias A. Zerhouni, M.D., "and it will aid in the development of new flu vaccines, therapies and diagnostics." "Scientists around the world can use the sequence data to compare different strains of the virus, identify...

Dinosaur extinction didn't cause the rise of present-day mammals, claim researchers

...overy rewrites our understanding of how we came to evolve on this planet, and the study as a whole gives a much clearer picture than ever before as to our place in nature." Dr Kate Jones from the Zoological Society of London adds: "Not only does this research show that the extinction of the dinosaurs did...

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