Name:                                                                         Block:                 

Endosymbiosis Case Study

The word symbiosis literally means the “living together more or less intimate association or close union of two dissimilar organisms” according to the Merriam-Webster Online Dictionary.  Endo refers to internal, and thus endosymbiosis refers to an internal “living together” within a single organism.  The process of endosymbiosis is observed often in biology, for example a variety of marine coral species hold bacteria species that photosynthesize and thus provide energy for the coral; this is only one example of many examples.  

In this case study you will examine the concept of endosymbiosis and the concepts connection to the development of eukaryotic cells.  The case study is provided by UC Berkeley which can be found here.

Part A: Endosymbiosis Case Study

  1. Describe symbiosis:

  1. Name and briefly describe the three types of symbiosis:


  1. Draw a diagram to summarize endosymbiosis

  1. Describe three types of evidence for Eukaryotes forming by endosymbiosis
  1. Membranes:

  1. DNA:

  1. Reproduction:

  1. What does the evidence suggest for the presence of chloroplast in some cells but not in others?

Part B: McGraw-Hill Endosymbiosis Animation

  1. What type of transport does the development of Eukaryotes by endosymbiosis represent?

  1. What does the animation provide as evidence for endosymbiosis?

  1. Where does the animation suggest mitochondria and chloroplasts were derived from?