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Explorations Through Time

Explorations Through Time
Related:  Natural Selection and Adaptation

Click and Learn Home Grown Fun | Homemade Fossils – MADE EASY! It’s easy to “mix up some mesozoic” at home or at school! Making homemade fossils is fun and addictive. We’ve got a simple recipe for creating rock-like relics sure to bring out the Paleontologist in everyone! Below you’ll find our cute video with basic instructions plus a list of materials and extra tips for success. Also lower down the page get details on how to prepare for a group event and suggestions for teaching about fossils in an exciting way! Materials Needed PLASTER OF PARIS – One 4.5 lb. box per 125 students – approximately $5.00.LITTLE PLASTIC CREATURES OR OBJECTS – These objects should be small enough to fit in the middle of the cup. Helpful Tips and Tricks The flattened clay ball should take up less than half the cup.Flatten the clay well before making the impression.Place the object upside down in the clay.DO NOT bury the object. Planning Guidance for Large Groups of Students BEFORE THE EVENT – Prepare Materials. e the event. Make Mud for the Bottom of the Lake. Make Fossils!

100 Years of Breed “Improvement” | Science of Dogs 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. The dogs on the left are from the 1915 book, ‘Breeds of All Nations‘ by W.E. It seems incredible that at one time the Bull Terrier was a handsome, athletic dog. The Basset Hound has gotten lower, has suffered changes to its rear leg structure, has excessive skin, vertebra problems, droopy eyes prone to entropion and ectropion and excessively large ears. A shorter face means a host of problems. Once a noble working dog, the modern St. Like this:

BioInteractive Search Results Series Where and when did humans arise? What distinguishes us from other species? Did our distant ancestors look and behave like us? How has the amazing diversity of plants and animals evolved? What can fossils, butterflies, and stickleback fish tell us about the deep common ancestry of all living forms? Leading evolution educator Ken Miller discusses the controversy surrounding the teaching of evolution. Four talks focus on sex determination—the molecular and genetic mechanisms that determine whether an organism will be male, female or a hermaphrodite. This series of short films has been crafted to engage students with memorable examples of the evolutionary process in action. Has Earth changed over deep time? The richness and diversity of life raises two of the most profound questions in biology: How do new species form? The most profound discoveries in science have cracked longstanding mysteries and altered how we think about life on our planet.

Coffee Ground Fossils Ages school-age Create your own fossils to display by using old coffee grounds. These work well as visual aids for science projects and makes a fun Earth Day craft for kids. What you'll need 1 cup of used coffee grounds 1/2 cup of cold coffee 1 cup of flour 1/2 cup of salt Wax paper Mixing bowl Some small objects to make impressions in the dough (Shaped cookie cutters work well.) Helpful Tip: To reduce the drying time, bake the fosils for a short period of time to get the "dough" to harden. How to make it Stir together the coffee grounds, cold coffee, flour, and salt until well mixed. The driving force for molecular evolution of translation BioInteractive Search Results Lectures How reasoning and evidence are used to understand human evolution. Genetic evidence shows that humans evolved in Africa and continue to evolve. Stone tools are well-preserved evidence of past human activity. The hominid fossil record of the past six million years gives us surprising insights into the path of human evolution. How humans perceive bitter taste, and the evolution of taste perception. How Darwin came to publish The Origin of Species, and examples of how quickly evolution can change a population. Comparing the artificial selection of dogs and corn with the natural selection of the stickleback fish. The genetic mechanisms by which evolution occurs, and an overview of the evidence for evolutionary theory. How and why butterflies and fruit flies got their spots, and the fossil record for human evolution. A discussion on reconciling religion and science with students, the lecturers, and guest speakers. Microbes have been the dominant life form throughout Earth's history. Dr. Dr.

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. “The Y chromosome has lost 90 percent of the genes it once shared with the X chromosome, and some scientists have speculated that the Y chromosome will disappear in less than 5 million years,” said evolutionary biologist Melissa A. The study also acknowledged that few mammals have completely lost their Y chromosome. “Our study demonstrates that the genes that have been maintained, and those that migrated from the X to the Y, are important, and the human Y is going to stick around for a long while,” Sayres added. “Melissa’s results are quite stunning.

Understanding Evolution The bacteria that changed the world - May, 2017 The make-up of Earth's atmosphere, once the domain of Earth science textbooks, has become an increasingly "hot" news topic in recent decades, as we struggle to curb global warming by limiting the carbon dioxide that human activity produces. While the changes that humanity has wrought on the planet are dramatic, this isn’t the first time that one species has changed Earth’s atmosphere. Three billion years ago, there was no free oxygen in the atmosphere at all. Life was anaerobic, meaning that it did not need oxygen to live and grow. That all changed due to the evolution of Cyanobacteria, a group of single-celled, blue-green bacteria. Read the rest of the story here | See the Evo in the News archive

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? These compounds work by attacking the nervous system. So, how do resistant bed bugs survive pyrethroid spraying? Such mutations arise randomly and are favored when a population of organisms winds up in an environment in which the mutations happen to be useful — in this case a bed sprayed with a pyrethroid. The key to this process of natural selection is having the right genetic variation in the insect population. And evolve rapidly they have! Read more about it Primary literature: Yoon, K. News articles: Understanding Evolution resources: Discussion and extension questions Review some background information on natural selection. Related lessons and teaching resources Teach about natural selection and random mutations: In this classroom activity for grades 9-12, students build, evolve, and modify paper-and-straw "birds" to simulate natural selection acting on random mutations.

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. David Epstein and John Manners help Greg untangle a web of potential factors - from something in the cornmeal to simple economics. Epigenetic Feedback Regulation Accelerates Adaptation and Evolution A simple cell model consisting of a gene regulatory network with epigenetic feedback regulation is studied to evaluate the effect of epigenetic dynamics on adaptation and evolution. We find that, the type of epigenetic dynamics considered enables a cell to adapt to unfamiliar environmental changes, for which no regulatory program has been prepared, through noise-driven selection of a cellular state with a high growth rate. Furthermore, we demonstrate that the inclusion of epigenetic regulation promotes evolutionary development of a regulatory network that can respond to environmental changes in a fast and precise manner. These results strongly suggest that epigenetic feedback regulation in gene expression dynamics provides a significant increase in fitness by engendering an increase in cellular plasticity during adaptation and evolution. Figures Citation: Furusawa C, Kaneko K (2013) Epigenetic Feedback Regulation Accelerates Adaptation and Evolution. Editor: Miguel A. Introduction Model .

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