This is an interesting post about the accuracy of the molecular clock in estimating speciation events particularly humans. There is a link to info on Fossil dating .
There are lots of great research questions that stem from this post. When thinking about topic 1, what questions do you have about the data collected and how the data was collected?
Choose your favorite photograph of a vanishing world by National Geographic photographer Brian Skerry. Portraits of Planet Ocean opens in February 2013. Select your favorite image, scroll to the Bottom, and cast your vote below.
Have you ever wondered how scientists work with tiny molecules that they can't see? Here's your chance to try it yourself! Sort and measure DNA strands by running your own gel electrophoresis experiment. This is a great visual for learning how to do electrophoresis.
USC (US) - Scientists have discovered tiny, filamentous bacteria that link up like living power cables to transmit electrons thousands of cell lengths away. The Desulfobulbus bacterial cells, which are only a few thousandths of a millimeter long each, are so tiny that they are invisible to the naked eye.
PRINCETON (US) - "Is evolution predictable? To a surprising extent the answer is 'yes'," says Princeton professor Peter Andolfatto. New research by Andolfatto and colleagues published in the journal suggests that knowledge of a species' genes-and how certain external conditions affect the proteins encoded by those genes-could be used to determine a predictable evolutionary pattern driven by outside factors.
IOWA STATE (US) - Aphids not only have a unique ability to block the genetic defense response of soybeans, but they may also open the door for other pests to do even more damage to crops.
Cross-posted at Denim and Tweed. In the course of adaptive evolution - evolutionary change via natural selection - gene variants that increase the odds of survival and reproduction become more common in a population as a whole. When we're only talking about a single gene variant with a strong beneficial effect, that makes for a...
By Gretchen Cuda Kroen Frozen water droplets take on a whole new shape when they freeze: Instead of staying round, they form a pointy tip, and eventually sprout a tiny forest of ice crystals on their surface. In order to observe these effects, researchers dripped tiny beads of water on a plate kept at a chilly -20°C.
Alaska and other plaintiffs that include hunters and the California Cattlemen's Association are appealing a federal court ruling last year that upheld the Interior Department's 2008 designation of the bears as threatened because their icy habitat is melting away. Murray Feldman, a lawyer for Alaska and other appellants, told the U.S.
By Matthew Cobb Some religious folk accept that micro-evolution can be observed - shifts in allele frequency due to natural selection - but argue vociferously that no one has ever seen one species evolve out of another. We know that one reason for this apparent lack of evidence for speciation is due to the time-scales...
By Alister Doyle OSLO (Reuters) - Pesticides used in farming are also killing worker bumblebees and damaging their ability to gather food, meaning colonies that are vital for plant pollination are more likely to fail when they are used, a study showed on Sunday.