Nov6,10,06

Nov6,10,06 - November 6, 2006 Manufacturing Plants o Just...

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November 6, 2006 Manufacturing Plants o Just as we shape our environment, our environment shapes us (essential to life, food, and oxygen) Agriculture o Defined as the cultivation and/or domestication of plants and animals (at a minimum, to plant and harvest, and to plant again) o Currently a huge business, accounts for our new lifestyle o History First hunters and gatherers – small nomadic populations Agricultural revolution – 10,000 years ago Occurred independently throughout the world In this way, humans have selected for plants through domestication ( beginning of engineering) 15 different plants contribute to most of our diet o Sunflower the only one to originate in North America o Top 4 –sugar cane, wheat, rice, and maize (corn) Common feature of domestication plants o Seeds germinate early because the first seeds to mature were the first harvested – loss of seed dormancy o Large seeds, large vegetative parts o Uniform ripening o Non-shattering – seeds don’t fall off stem All of these changes occurred from unconscious selection Until the 1930’s, there wasn’t a conscious effort to improve crops o Ex – hybrid corn – focus on intentional breeding using Mendel’s discoveries 1960’s – Green Revolution o Food crisis o Lots of money allocated towards agricultural research
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Nov6,10,06 - November 6, 2006 Manufacturing Plants o Just...

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