The Twists And Turns Of The Evolution Of Life On Earth

In an evolutionary tree, neat branches link the paths of different species back through time. As you follow the forking paths, you can trace common ancestors, winding down the trunk to see the root organism in common. 

Evolution in the real world is a little messier—full of dead ends and changes happening beneath the surface, even before new traits and species appear. And the research and science that gave us a better picture about how life evolved on Earth can just be just as complicated.  

Evolutionary biologist Neil Shubin, author of Some Assembly Required: Decoding Four Billion Years of Life, from Ancient Fossils to DNA, explains how technology like DNA sequences has allowed scientists to fill in these gaps in the story of evolution. 

New research published this week in the Proceedings of the National Academy of Sciences indicates that honey bees infected with a virus may alter their behavior in ways that slow the spread of the infection. At the same time, infection with the virus may help the bees sneak into neighboring hives, potentially spreading the virus to new hosts.

Adam Dolezal, an assistant professor of entomology at the University of Illinois at Urbana-Champaign and one of the authors of the study, describes the research, and the evolutionary arms race that may be taking place between the bees and the virus.

Earlier this month, the Lost Apple Project in Washington state announced a fruitful bounty: Ten varieties of apples found in the Pacific Northwest that had been considered “lost” varieties. These include the Sary Sinap, originally from Turkey, and the Streaked Pippin from New York.

To find these varieties, the researchers used an old school identification process—the partner organization, Temperate Orchard Conservancy, compared the mystery apples to watercolor paintings commissioned by the USDA from the 1800s and early 1900s. It’s a time consuming process, and positive identification can take years.

Joining Ira to talk apple identification are Shaun Shepherd, pomologist at the Temperate Orchard Conservancy in Portland, Oregon, and Gayle Volk, plant physiologist at the USDA in Fort Collins, Colorado.

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