Endosymbiotic Theory

Eukaryotes—were we born from an act of predation that backfired? Ponder this and other questions of evolution with a video from a well-written biology playlist. Topics include the origins of mitochondria and chloroplasts, unusual behaviors of both organelles, and present-day examples of endosymbiosis.

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CCSS: Adaptable
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Instructional Ideas
  • Have the class read an article about the microbes living inside termites, then show the video
  • Plan discussion time after the video to talk about the multiple lines of evidence scientists have that support endosymbiotic theory
Classroom Considerations
  • Compare and contrast mitochondria and chloroplasts with middle schoolers before viewing to make sure they understand the functions of both
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
  • The narrator does a fantastic job of presenting the theory and evolutionary lines associated with it
  • Diagrams help clarify some of the more difficult aspects of the content
  • None
Common Core