Evolution: Library: Threat of Tuberculosis It's sobering to realize that the ancient scourge, tuberculosis, which has been found in 2,000-year-old mummies, remains a global health threat despite modern medicine. In fact, TB is the leading infectious disease killer in the world, causing nearly 3 million deaths in 1996. Millions of people -- fully one-third of the world's population -- are infected with the TB bacterium. Five to 10 percent of those will develop the active disease, for reasons we only partially understand. The bacteria can lie dormant for many years, and become active when the host is weakened by factors such as stress, poor nutrition, diabetes, or HIV infection.
100 Years of Breed “Improvement” For the sake of honest disclosure, I will admit to owning “purebreds” (the ‘pureness’ of purebreeds is a discussion for another time) but I also have mutts. All the dogs I’ve had since childhood had a few things in common, they were friendly, prey driven, ball-crazy, intense, motivated, athletic (crazy dogs are easier to train) and none had intentionally bred defects. I would never buy/adopt a dog whose breed characteristics exacted a health burden.(Asher 2009). That just incentivizes people to breed more of these intentionally unhealthy animals.
Classroom Activity Objective To learn through an evolution card game how selective pressures can affect an organism's evolution. copy of the "From Wolf to Dog" student handout (PDF or HTML)copy of the "Examining the Game" student handout (PDF or HTML)copy of the "Wolf Deck" student handout (PDF or HTML)scissors1 die Scientists know all dogs descended from the gray wolf, but they don't know exactly how that happened. Tell students that in this activity they are going to engage in a simulation to learn how selective pressures can affect an organism's evolution. Review with students the concepts of gene, gene pool, selective pressure, mutation, species, and genetic isolation (see Activity Answer for definitions).
Conflicting Selection Pressures Copyright© Copyright The Concord Consortium Record Link <a href="stem-resources/conflicting-selection-pressures">The Concord Consortium. Conflicting Selection Pressures. Concord: The Concord Consortium, 2010, September 11.</a> Phylogeny Programs Here are 392 phylogeny packages and 54 free web servers, (almost) all that I know about. It is an attempt to be completely comprehensive. I have not made any attempt to exclude programs that do not meet some standard of quality or importance. Short Films “Film is a powerful way to tell stories. … The right story, told well, can be engaging, informative, and memorable.” —Sean B. Carroll HHMI’s series of short films for the classroom brings fascinating stories of science and scientists to students and teachers. The films aim to bring important scientific advances to life with concrete examples of how science works, how evidence is weighed and tested, and how conclusions are reached.
Male Chromosomes Are Not Dying Soon, Study Finds : News Update Date: Jan 11, 2014 05:31 PM EST A new study has challenged the notion that Y chromosomes are largely unimportant and will no longer exist in the next 5 million years. (Photo : Image Editor/Flickr) A new study has challenged the notion that Y chromosomes are largely unimportant and will no longer exist in the next 5 million years. The study has based its findings on a comparison of Y chromosomes in eight African and eight European men. Who Evolved on First? Bud Abbott and Lou Costello While I was writing this post, I heard that Bill Nye and Ken Ham are planning to have a debate about evolution and creation. While it could be an interesting conversation, I suspect that it will suffer from the same communication problems that afflict most of these debates. Have you ever heard the brilliant comedy routine, “Who’s on first?” by Bud Abbott and Lou Costello? If not, you should listen to it before you continue reading.
Cut and Run Legions of athletes, sports gurus, and scientists have tried to figure out why Kenyans dominate long-distance running. In this short, we stumble across a surprising, and sort of terrifying, explanation. At the 1968 summer Olympics in Mexico City, Kipchoge Keino overcame a gall bladder infection to win gold in the 1500 meter race. Since then, one particular group of Kenyans - the Kalenjin - has produced an astonishing number of great long-distance runners. Gregory Warner - NPR's East Africa correspondent - takes Jad and Robert down a rabbit hole of theories about what exactly is going on in Kalenjin country. David Epstein and John Manners help Greg untangle a web of potential factors - from something in the cornmeal to simple economics. Bed bugs bite back thanks to evolution Resource library : Evo in the news : Bed bugs bite back thanks to evolutionSeptember 2010 Where's the evolution? What's to be done if you wind up the unhappy bunkmate to a nest of these pests? In the past, the answer was simply to spray with a pesticide. Unfortunately, that response is less effective than it used to be — not because the pesticides used today are weak — but because bed bugs have evolved resistance to the most commonly used chemicals.
The Zoo of You By Neil Shubin Posted 10.26.09 NOVA You may not feel much like a shark, fruit fly, or worm, but you share many aspects of your anatomy and physiology with these and all other animals on Earth. All the various bits and pieces of you–organs, bones, nerves, even your genes–show up in different but fundamentally similar forms in other animals, in some cases animals that lived half a billion years ago, revealing how all creatures on Earth, including you, are just variations on a theme. Launch Interactive Natural Selection Copyright© Copyright The Concord Consortium Record Link <a href="stem-resources/natural-selection">The Concord Consortium. Natural Selection. Concord: The Concord Consortium, 2010, September 26.</a>