Having genetic diversity allows organisms to fight off diseases. Cavendish bananas are genetic clones of one another, so the recent spread of Panama Disease Tropical Race 4 is devastating banana plantations around the world.
http://news.msn.com/science-technology/is-it-time-to-say-bye-bye-to-the-banana
Bacteria, on the other hand, create genetic diversity through mutations, allowing them to become antibiotic resistant.
http://www.brainpop.com/health/diseasesinjuriesandconditions/antibioticresistance/
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