Paris/Project Description/Paris/colonial theory of evolution of multicellularity
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Proposed by Haeckel in 1874, the colonial theory claims that the symbiosis of many organisms of the same species led to multicellular organisms. There are essentially two ways to make a simple multicellular entity out of single cells: either a single cell divides and its offspring stick together, or several solitary cells aggregate to form a colony. Division and adhesion is characteristic of multicellular forms of aquatic origin (from an egg), whereas aggregation is typical in terrestrially derived colonies (example: Gonium). | Proposed by Haeckel in 1874, the colonial theory claims that the symbiosis of many organisms of the same species led to multicellular organisms. There are essentially two ways to make a simple multicellular entity out of single cells: either a single cell divides and its offspring stick together, or several solitary cells aggregate to form a colony. Division and adhesion is characteristic of multicellular forms of aquatic origin (from an egg), whereas aggregation is typical in terrestrially derived colonies (example: Gonium). | ||
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| - | [[Image: Paris/ | + | [[Image: Paris/Ernst_haeckel.jpg|Ersnt Haeckel|right]] |
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Sources: <br> | Sources: <br> | ||
- Wolpert L, Eörs Szathmáry. Nature 2002 Vol.420 p745 <br> | - Wolpert L, Eörs Szathmáry. Nature 2002 Vol.420 p745 <br> | ||
- Wikipedia | - Wikipedia | ||
Revision as of 12:47, 15 October 2007
Colonial theory of evolution of multicellularity
Proposed by Haeckel in 1874, the colonial theory claims that the symbiosis of many organisms of the same species led to multicellular organisms. There are essentially two ways to make a simple multicellular entity out of single cells: either a single cell divides and its offspring stick together, or several solitary cells aggregate to form a colony. Division and adhesion is characteristic of multicellular forms of aquatic origin (from an egg), whereas aggregation is typical in terrestrially derived colonies (example: Gonium).
Sources:
- Wolpert L, Eörs Szathmáry. Nature 2002 Vol.420 p745
- Wikipedia
