Quantcast

Latest Natural selection Stories

277bfd88b7552d358a5c984037bf5cde
2010-03-04 14:58:03

Two Dartmouth biologists have found that brown anole lizards make an interesting choice when deciding which males should father their offspring. The females of this species mate with several males, then produce more sons with sperm from large fathers, and more daughters with sperm from smaller fathers. The researchers believe that the lizards do this to ensure that the genes from large fathers are passed on to sons, who stand to benefit from inheriting the genes for large size. The study is...

2010-02-25 10:24:23

The team observed viruses as they evolved over hundreds of generations to infect bacteria. They found that when the bacteria could evolve defenses, the viruses evolved at a quicker rate and generated greater diversity, compared to situations where the bacteria were unable to adapt to the viral infection. The study shows, for the first time, that the American evolutionary biologist Leigh Van Valen was correct in his 'Red Queen Hypothesis'. The theory, first put forward in the 1970s, was named...

2010-02-17 14:07:53

The unexpected discovery of a new type of genetic variation suggests that natural selection "“ the force that drives evolution "“ is both more powerful and more complex than scientists have thought. "We have discovered that natural selection can act not only on whole organisms and individual genes, but also on gene networks," says Antonis Rokas, assistant professor of biological sciences at Vanderbilt University and senior author of the paper reporting the discovery that was...

883d1b4c10086e8fe50bb12bdd65e6cc
2010-02-02 07:12:41

Research findings introduce fundamental shift in how biologists perceive relationship between evolution and ecology Biologists have known for long that ecology, the interaction between organisms and their environment, plays a significant role in forming new species and in modifying living ones. The traditional view is that ecology shapes evolution. The environment defines a template and the process of evolution by natural selection shapes organisms to fit that template. Some specialized...

6e74a3f7608bbaacc0fcee35cb270f1d1
2010-01-14 12:15:48

Genes are being tested for roles in most conspicuous variations among dogs From the Dachshund's stubby legs to the Shar-Pei's wrinkly skin, breeding for certain characteristics has left its mark on the dog genome. Researchers have identified 155 regions on the canine genome that appear to have been influenced by selective breeding. With more than 400 distinct breeds, dogs come in a wide range of shapes, sizes, fur-styles, and temperaments. The curly-haired toy poodle, small enough to sit in a...

2010-01-11 13:12:07

Scientists call for integrating evolutionary perspectives into medical curricula The subtle but ongoing pressures of human evolution could explain the seeming rise of disorders such as autism, autoimmune diseases, and reproductive cancers, researchers write in the Proceedings of the National Academy of Sciences. Certain adaptations that once benefited humans may now be helping such ailments persist in spite of "“ or perhaps because of "“ advancements in modern culture and...

2010-01-08 12:38:13

Researchers devise method to pinpoint key genetic variations under positive natural selection that may impact human health Fossils may provide tantalizing clues to human history but they also lack some vital information, such as revealing which pieces of human DNA have been favored by evolution because they confer beneficial traits "” resistance to infection or the ability to digest milk, for example. These signs can only be revealed through genetic studies of modern humans and other...

934c775630d0a7d740fb90bcda5273b01
2009-12-30 09:25:00

Does it matter if nature solves the same problem multiple ways? A NSF-supported study of lizard populations in White Sands, New Mexico has helped researcher Erica Rosenblum of the University of Idaho begin to answer that question. Published December 28 in the Proceedings of the National Academy of Sciences, the article describes genetic differences between lizards found in habitats that contain white or dark soils. These stark differences in color are an ideal environment to study natural...

2009-11-26 14:26:59

Is speciation adaptive? Darwin suggested that the action of natural selection can produce new species, but 150 years after the publication of his famous book, 'On the Origin of Species', debate still continues on the mechanisms of speciation. New research finds sexual selection to greatly enlarge the scope for adaptive speciation by triggering a positive feedback between mate choice and ecological diversification that can eventually eliminate gene flow between species. By means of a...

364c2ff82b22776934fe5ac64a2c1b461
2009-11-21 09:03:03

Honoring 150 years of "On the Origin of Species;" Noor is recipient of Darwin-Wallace Medal Please join the National Science Foundation (NSF) on Monday, Nov. 23, at 10 a.m. ET for a live webcast featuring Darwin-Wallace Medal recipient Mohamed Noor of Duke University, who will answer media questions about current evidence for evolution and modern evolution theory. Among the topics: * Does modern genetic evidence favor the existence of a missing link? * What's the single most important...


Word of the Day
reremouse
  • A bat.
The word 'reremouse' comes from Middle English reremous, from Old English hrēremūs, hrērmūs ("bat"), equivalent to rear (“to move, shake, stir”) +‎ mouse.
Related