What are the conditions necessary for this to take place (3pts)? How many times has this happened from an evolutionary perspective and how do you know? (3pts) Why do you think this is the case (in other words, why is it beneficial to be multicellular) (2pts)? What are the disadvantages to being multicellular? (2pts)
Added by Jordi D.
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- Cells must be able to stick together (cell adhesion). - Cells must communicate and coordinate with each other (cell signaling). - Cells must be able to differentiate and specialize in function. Show more…
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1. a. What are the pre-requisites for multicellularity to evolve? b. Why might multicellularity be beneficial? c. What fitness costs are there to multicellularity? d. How many times has multicellularity evolved? How do we know? e. RB gene - what type of gene is this (what function does it control) and why is this gene a candidate for the major step toward multicellularity
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What defines if a collection of cells is truly multicellular? Did multicellularity arise once or many times in the evolutionary process? What advantages do multicellular organisms have over unicellular ones?
Using examples studied in this laboratory, propose a hypothesis for the evolution of life on Earth from single-celled organisms to multicellular organisms. Reviewing your investigations of organisms in this laboratory, can you suggest the most significant step in the evolution of multicellularity? We often imply that multicellular organisms are more advanced (and therefore more successful) than unicellular or colonial organisms. Explain why this is not true using examples from this lab or elsewhere.
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