let’s do a little experiment what is natural selection? it is a simple concept, with many...
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Let’s do a little experiment
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What is Natural Selection?
• It is a simple concept, with many complexities surrounding it.
• Favorable heritable traits become more common, and unfavorable heritable traits become less common.
• Those that have favorable traits survive and reproduce
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• Our environment and our genes make us who we are---environmental pressures force our species to adapt
• If we adapt, our genes are passed on
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Which one would you choose?
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Here are some examples of highly adapted creatures
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Antibiotics—the perfect example of natural selection
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Bacteria reproduce quickly—more mutations—more change—more
likely to adapt
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Guided Practice
• I want you all to each write down an advantageous trait of an organism, and tell me why the species had to adapt to obtain that trait
• Can anyone think of a disadvantageous trait in an organism that is still around?
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These Changes occur very very
SLOWLY
Our earth has been around for 4.6 billion years and has had abundant life for over
500 million years, so a great deal can and has happened.
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• http://www.reneliomarin.com/images/img_large/canvas/FirstStepEvolu.jpg• http://dezignus.com/wp-content/uploads/2007/10/psevolution.jpg• http://www.listadodeanimales.com/animales/images/hojainsecto.jpg• http://www.gly.uga.edu/railsback/1122/1122Dogs.jpeg• http://images.google.com/imgres?imgurl=http://tugagames.com/victor/wp-content/uploads/
2007/10/crescent-moth.jpg&imgrefurl=http://www.drollthings.com/%3Fp%3D682&h=332&w=450&sz=49&hl=en&start=6&um=1&tbnid=ygRYo626M60NsM:&tbnh=94&tbnw=127&prev=/images%3Fq%3Dcamouflage%2Bmoth%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26channel%3Ds%26rls%3Dorg.mozilla:en-US:official%26sa%3DG
• http://www.treesforlife.org.uk/images/poplar_hawkmoth_caterpillar.jpg• http://www.learner.org/channel/courses/essential/life/images/show5.maize_teosinte.jpg• http://homepage.mac.com/wildlifeweb/mammal/african_wild_dog/african-wild-dog_02tk.jpg• http://animals.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/animals/images/
primary/dingo.jpg• http://www.bioteams.com/images/what_teams_can.jpg• http://www.africanfauna.com/images/jackal.jpg• http://k-punk.abstractdynamics.org/archives/orchid-thumb.jpg• http://farm1.static.flickr.com/55/117768119_b1b76f67d3.jpg• http://lifeboat.com/images/bacteria.jpg