Endosymbiosis

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Endosymbiosis

• SC.912.L.14.5

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Essential Questions

• How do scientists believe eukaryotic cells
  developed?

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Endosymbiotic Theory

• Eukaryotic cells formed from a symbiosis among
  several different prokaryotic organisms.

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Endosymbiotic Theory
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What is the evidence?

• 1. Membranes of chloroplasts and mitochondria
  resemble the plasma membranes of free-living
  prokaryotes.
• 2. Mitochondria and chloroplasts have DNA similar
  to bacterial DNA
• 3. Mitochondria and chloroplasts have ribosomes
  that are similar in size and structure to
  prokaryotes.
• 4. Mitochondria and chloroplasts reproduce by
  binary fission.

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Day 2 Five types of symbiosis

• Mutualism
• both species benefit
• Commensalism
• one species benefits, the other is unaffected
• Parasitism
• one species benefits, the other is harmed
• Competition
• neither species benefits
• Neutralism
• both species are unaffected

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Classify these four pictures
Foot Fungus
Oak Gal
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Which type of symbiosis is this?
To decide, make a list of any harm or benefit to
each organism.