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Published byAgnes Short Modified over 9 years ago
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Artificial Selection
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People (instead of nature) select which organisms get to reproduce and which traits have a better chance of being passed on No longer matters what is “most fit”
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Purpose of artificial selection Higher yield of offspring in plants Improved quality Reduced production costs Faster growth rates Greater resistance to diseases Cosmetic Hypoallergenic
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Who participates in artificial selection? Farmers All crops Breeders Farm animals Dogs Horses Scientists
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Why is artificial selection often referred to as selective breeding?
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Examples of artificial selection
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How has corn changed over the years? Why is this beneficial?
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Examples of artificial selection Dogs Originally domesticated for hunting, shepherding, and pest control. Eventually became companion animals
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Examples of artificial selection Horses Draft horses Racehorses
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Genetic Modification / Genetic Engineering -Genetic engineering techniques are used to alter DNA -DNA is altered and combined with other DNA to create an entirely new set of genes -Creates genetically modified organisms (GMO’s) -Occurs everywhere -85% of US corn and 91% of US soybeans are genetically engineered
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Artificial Selection versus Genetic Modification Which one is more effective? Genetic Modification/Engineering Quicker More Effective No limitations
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Why are people who support artificial selection often against genetic engineering?
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Weird examples of genetic engineering For each of the examples try to answer the following questions Do you support the example? Should we continue to genetically engineer organisms?
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Glow in the Dark Cats
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Pollution-Fighting Plants
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Venomous Cabbage
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Web-spinning goats
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Fast-growing salmon
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Flavr Savr Tomato
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Banana Vaccines
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Less-flatulent Cows
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Fast Growing Trees
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Medicinal Eggs
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Super Carbon-Capturing Plants
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Genetic Modification of Humans Should we allow it? What specifically should we allow? Where is the limit? How much is too much?
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