Articles tagged with Natural Selection
A 2004 hurricane provided a rare opportunity for scientists to study the founder effect, a concept that describes the loss of genetic variation in new populations. The study found that both natural selection and the founder effect played roles in shaping the lizard population's characteristics.
Researchers found that genetic and morphological traits were influenced by both natural selection and founder effects in castaway lizards. The study shows how these mechanisms interact with each other, resulting in differences between populations adapting to new environments.
Genetic analysis reveals that about a third of changes on the X chromosome have been beneficial for chimpanzees since divergence from humans, while most remain unchanged. This suggests that natural selection works stronger on the X chromosome than other genes.
A study of forked fungus beetles reveals that their social positions are related to reproductive success, suggesting that natural selection drives the evolution of social behavior. The researchers found that individual behaviors can influence their position in society, leading to varying levels of mating and reproduction.
Modules differ in form and function, allowing for division of labor among specialized modules. The study identifies necessary conditions for division of labor to evolve, including positional effects and synergistic effects between differentiated modules.
A new study found that the evolutionary shaping of floral scents in oil-secreting orchids is more closely tied to their genetic history than to natural selection driven by specific pollinators. Researchers discovered that scent profiles fell along phylogenetic lines, even when different bee species were involved.
Researchers identified a strategy of prevention that has evolved to compensate for the inefficiency of NMD by decreasing the frequency of nonsense errors. Human genes preferentially encode codons less likely to be mistranscribed into premature STOP codons, improving robustness to transcriptional errors.
A new study published in Nature suggests that biodiversity can evolve in complex environments where previously thought to be impossible. Researchers found that both 'fit' and 'unfit' species can coexist indefinitely due to trade-offs between growth rate and efficiency.
A new study found that larger body size and earlier seasonal timing confer significant survival advantages in most plants and animals. This 'bigger is better' model of evolution is more common than the rare 'Goldilocks' model, where individuals with moderate traits tend to outperform those that are too small or too large.
Researchers found a critical lag time between horse tooth evolution and dietary changes due to climate shifts. Horses' diets narrowed over millions of years, with strong natural selection for teeth only occurring occasionally.
Research on self-fertilization reveals that it may not always be an evolutionary advantage but can evolve as a side-effect of drought-avoiding life cycles. Flower shape evolution is also influenced by pollinator preferences, with different shapes preferred by different types of insects.
A NYU scientist concludes that Charles Darwin's theory of gradual evolution is not supported by geological history. Instead, Scottish horticulturist Patrick Matthew proposed a more accurate theory, highlighting the role of catastrophic mass extinctions in driving evolutionary changes.
Researchers develop new theory explaining the evolution of eusocial behavior, finding that standard natural selection is sufficient to account for cooperation in species like ants and bees. The study suggests that eusociality arises independently multiple times due to the stability of colonies once established.
Competition among lizards is more important than predation by birds and snakes for survival, according to a study published in Nature. The researchers found that high-density populations favor larger size and better running ability.
A field study found that intermediate testosterone production is associated with increased survival and reproductive success in male dark-eyed juncos. The researchers also discovered that high and low testosterone levels lead to decreased survival rates, contradicting previous expectations.
Research suggests that certain adaptations that once benefited humans may now be helping such ailments persist in spite of advancements in modern culture and medicine. Evolutionary perspectives integrated into medical curricula could help future physicians understand health problems from an evolutionary perspective.
Researchers devised method to precisely track evolution's influence on human health by identifying key genetic variations under positive natural selection. The study used a new approach called Composite of Multiple Signals (CMS) to pinpoint specific genes and changes in the genome.
A new analysis of a long-term survey of human health shows that humans are still evolving due to natural selection. The study found that the descendants of over 2000 women in the Framingham Heart Study will be slightly shorter and heavier, have lower blood pressure and cholesterol, and reach menopause later in life.
Termites' non-reproductive offspring may have inherited their parents' throne, answering a question posed by Charles Darwin nearly 150 years ago. This new research suggests staying at home could have given these first termites an advantage to become reproducers.
Deer mice living in Nebraska's Sand Hills rapidly adapted to their environment by evolving lighter coloration, providing better camouflage against visual predators. This genetic change arose from a single mutation in the Agouti gene, driven by natural selection favoring pale coloration.
A study published in Science found that changing winter conditions are causing Scotland's wild Soay sheep to get smaller. The researchers suggest that this is an ecological response to environmental variation over the last 25 years, rather than evolutionary change.
A new study suggests that genetic variations in humans are more closely tied to geographical and historical factors than previously thought. The research found that gene variants tend to be distributed throughout the world in patterns reflecting ancient population movements and other aspects of population history.
A recent study by Penn State researchers suggests that several statistical methods used to detect natural selection at the molecular level are faulty. This has implications for the interpretation of hundreds of published studies on human evolution and the role of natural selection in shaping human traits.
Bacteria in biofilms evolve to become more resilient with age, resisting antibiotics and outcompeting younger cells. This study provides evidence of natural selection in a single species bacterial biofilm, offering insights into the emergence of dominant microbial populations.
Anthropologist Karen Rosenberg sheds light on the evolutionary significance of childbirth, revealing that social assistance during labor is a distinctive human characteristic. Her research highlights the importance of cooperative childcare and social intelligence in reproductive success.
Researchers at Uppsala University identified fast-evolving human genes with patterns of molecular evolution not driven by natural selection. Instead, biased gene conversion (BGC) speeds up the rate of evolution in certain genes, fixing harmful mutations.
Researchers discovered that butterfly species with similar wing patterns have evolved to live in the same territory, maximizing benefits of their appearance. This adaptation highlights the role of protection from predators in evolution beyond pure competition.
Researchers at Princeton University have discovered that protein chains act as adaptive machines, controlling their own evolution in response to natural selection. This finding extends Darwin's model and suggests that organisms can subtly direct aspects of their evolution to create order out of randomness.
Researchers analyzed 3006 species and found a narrow range of metabolic rates, averaging 0.3-9 Watts per kilogram, which may be linked to the organization of life on Earth. This optimal rate may have favored complex adaptations like breathing and leaf shape.
Biologists studied male copulatory organ size and horn length in Onthophagus taurus, finding substantial differences between populations. The study suggests that natural selection can drive speciation by making individuals from different populations sexually incompatible, potentially leading to the origin of new species.
Researchers at Stanford University School of Medicine discovered that specific genetic instructions drive aging in worms, shifting the focus away from tissue damage accumulation. The study found age-related changes in transcription factors that regulate genes, triggering pathways that transform young worms into older ones.
Researchers developed computer models of RNA molecules evolving by mutation and natural selection, showing that optimal organisms often require a long sequence of interacting mutations. This challenges the idea that natural selection always leads to the best possible organisms in the long run.
Researchers develop algorithm to analyze financial data and predict company failure, outperforming single-approach methods. The hybrid approach uses genetic-based weighting to identify fittest variables, allowing for accurate predictions of financial future.
A new Stanford University study reveals that human cultural traits are subject to natural selection, with functional traits evolving at a slower rate than decorative ones. The research compares Polynesian canoe designs and finds that faster or slower evolution rates indicate the presence of natural selection.
A study published in Nature found that when individuals are choosy about their partners, cooperativeness increases and becomes more stable. This is because individuals with low cooperativeness are penalized by being left by their current partner for a more cooperative one.
Edward O. Wilson's article in BioScience presents a new perspective on the evolution of eusociality in insects, suggesting that natural selection acts on nascent colonies rather than individual traits. This challenges the traditional explanation based on kin selection, highlighting the complexity of social organization in these species.
A team of researchers has demonstrated how a single gene in yeast divides and adapts to improve its environment, showcasing the driving force of natural selection. This study provides the most basic view of how organisms evolve to better adapt to their environments.
Researchers at UF discover a powerful link between protein evolution and metabolic rate across various species, including fish and mammals. The study reveals that rates of protein evolution are strongly influenced by individual metabolic rates.
Researchers analyze gene for bitter-taste receptor, finding evidence of balancing natural selection that keeps two forms active. The study suggests PTC nontasters can perceive a different compound than tasters, potentially conferring protection from a toxic compound.
Studies on Mexican cavefish reveal distinct evolutionary pathways for eyes and pigmentation. Evolution by natural selection drives eye regression due to metabolic costs, while genetic drift influences pigment cell density variations.
A study in PLOS ONE finds that genetically variable wolves are more likely to be recruited into the breeding population, reducing the negative effects of inbreeding. This means the accumulation of inbreeding's negative effects will occur much slower than previously believed.
Researchers found that island lizards' hind legs shifted from longer to shorter limbs in just six months, favoring survival in a new predatory environment. This rapid evolution highlights the importance of behavioral flexibility in driving evolutionary changes.
Park Grass study demonstrates the value of long-term experiments in ecological studies, revealing new insights into plant biodiversity, competition between plants, and climate change effects. The experiment has inspired new ecological theory and has helped ecologists recognize its importance.
Scientists have developed a statistical method to test for natural selection at the single-gene level, using genomic data. They applied this method to the FRIGIDA (FRI) gene in Arabidopsis thaliana and found evidence of natural selection changing the behavior of the plants.
Researchers found that bacteria gain resistance through only a small fraction of the 120 possible mutational paths in a key gene. Most pathways fail to continuously improve resistance, contradicting traditional views on evolution by natural selection.
A study provides empirical support for natural selection's role in species formation by analyzing the relationship between adaptation and reproductive isolation in hundreds of organisms. The researchers found a positive link between these two processes, suggesting that adaptation drives species diversification.
Recent genetic epidemiology studies have empirically supported Mayr's ideas on genetic interaction and its impact on evolutionary change. These studies show that genes interact extensively, leading to a strong interaction between natural selection and genetic drift, resulting in 'genetic revolution.'
Researchers found that guppies from high-predation environments reproduce earlier and live longer due to a selective increase in reproductive lifespan. The study supports the hypothesis that natural selection influences only specific segments of an organism's lifespan.
A study published in Nature analyzed 11,624 genes and found that around 9% have evolved too rapidly to be explained by chance. The researchers suggest that positive Darwinian natural selection is responsible for the increased rate of evolution, particularly in genes involved in immune function and sensory perception.
Recent studies suggest that major variants in genes Microcephalin and ASPM are evolving under strong natural selection in modern human populations. These genetic changes may have emerged as a result of cultural evolution and the spread of agriculture and written language, coinciding with key milestones in human history.
A new study overturns decades-old theory, suggesting that gene mutation rates can affect fixation rates in species. The research found that faster mutations are more likely to be accepted by genes, leading to a shift in the understanding of natural selection.
Dr. Longo's research suggests that the majority of a population dies prematurely to provide nutrients for a few individuals with acquired genetic mutations, raising the possibility of programmed human aging.
Researchers discovered strong evidence for natural selection at eight genes in European-American populations, likely related to environmental conditions. The study found connections between genetic variation and diseases such as diabetes, obesity, high blood pressure, kidney disease, and Alzheimer's.
A genetic variant associated with increased heart disease risk emerged rapidly in the ancient European population around 24,000 years ago. The high-expression variant is linked to a mutation hotspot in MMP-3's regulatory DNA.
A new theory on aging, proposed by Ronald D. Lee, suggests that natural selection favors animals capable of devoting energy to insure survival of the next generation. This theory attempts to fill in gaps of previous ideas on aging and its relationship with nurturing behavior.
Researchers have identified a gene, Nup 96, that plays a crucial role in preventing the reproduction of hybrid fruit fly species, suggesting natural selection as the driving force behind their divergence. The study provides unprecedented insight into speciation and offers new avenues for understanding the evolution of genetic traits.
Researchers from Leiden investigated the role of constraints in evolution using tropical butterflies. They found that constraints sometimes play a role and sometimes do not, contradicting previous assumptions about natural selection.
The Darwin Correspondence Project has published 12 of a projected 32-volume set of Darwin's letters, shedding light on his evolutionary ideas. The project is sending these volumes back to the Charles Darwin Research Station in the Galapagos, where Darwin's research began.
Researchers Aviv Bergman and Mark Siegal found that complexity of genotypes, rather than natural selection, provides fidelity in development. They argue that functional genetic networks with enough complexity exhibit built-in property of fidelity, unaffected by environmental disturbances or natural selection.
Researchers found that about 25% of genes in fruit flies are evolving rapidly in response to competitive pressures, contradicting the neutral theory. In humans, around 35% of accumulated changes are 'good,' contributing to disease resistance and sexual reproduction, highlighting the ongoing role of natural selection.