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Transegenes
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Genes
from one species used to enhance another
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Food security
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•the
guarantee of adequate and reliable food supply to all people at all times
•Fewer
people today are hungry than in 1970
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Undernourishment
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•people
receive less than 90% of their daily caloric needs
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Overnutrition
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Receiving too much calories
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Malnutrtion
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•a
shortage of nutrients the body needs
-The diet lacks adequate vitamins and
minerals
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Kwashiorkor
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•diets
lacking protein or essential amino acids
-Occurs when children stop breast-feeding
-Bloated stomach, mental and physical
disabilities
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Marasmus
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•protein
deficiency and insufficient calories
-Wasting or shriveling of the body
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Monoculture
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•a
large expanse of a single crop
-More efficient, increases output
-Devastates biodiversity
-Susceptible to disease and pests
•Narrows
human diet: 90% of our food comes from 15 crop species and 8 livestock species
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Pest
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Any organism that damages valuable crops
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Weed
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Any plant that competes with crops
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Pesticides
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Poisons that kill pest organismsinsecticides, herbicides, fungicides
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Evolutionary arms race
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-chemists increase chemical toxicity to
compete with resistant pests
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Biological control, biocontrol
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•uses
a pest’s
natural predators to control the pest
-Reduces pest populations without
chemicals
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Bacillus
thuringiensis
(Bt)
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-soil bacteria that kills many pests
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Integrated pest management techniques
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-Biocontrol
-Chemicals, when necessary
-Population monitoring
-Habitat alteration
-Crop rotation and transgenic crops
-Alternative tillage methods
-Mechanical pest removal
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