Multicellular organism: Difference between revisions
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'''Multicellular organisms''' are [[organism]]s consisting of more than one [[cell (biology)|cell]], and having [[differentiated cell]]s that perform specialized functions in the organism. Most life that can be seen with the naked eye is multicellular, as are all members of the [[kingdom (biology)|kingdom]]s [[Plant]]ae and [[Animal]]ia (except for specialized organisms such as [[Myxozoa]] in the case of the latter). |
'''Multicellular organisms''' are [[organism]]s consisting of more than one [[cell (biology)|cell]], and having [[differentiated cell]]s that perform specialized functions in the organism. Most life that can be seen with the naked eye is multicellular, as are all members of the [[kingdom (biology)|kingdom]]s [[Plant]]ae and [[Animal]]ia (except for specialized organisms such as [[Myxozoa]] in the case of the latter). |
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==Evolutionary history== |
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{{main|Evolution of multicellularity}} |
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Early life was most probably single celled and multicellularity has appeared dozens of times in the history of Earth.<ref>Bonner, J.T. (1998) The origins of multicellularity. Integr. Biol. 1, 27–36</ref> In order to reproduce, true multicellular organisms must solve the problem of regenerating a whole organism from [[germ cell]]s (i.e. [[sperma]] and [[ovum|egg]] cells), an issue that is studied in [[developmental biology]]. Therefore, the development of [[sexual reproduction]] in unicellular organisms during the [[Mesoproterozoic]] is thought to have precipitated the development and rise of multicellular life. |
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Multicellular organisms also face the challenge of [[cancer]], which occurs when cells fail to regulate their growth within the normal program of development. |
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==See also== |
==See also== |
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Revision as of 07:45, 11 August 2009
Multicellular organisms are organisms consisting of more than one cell, and having differentiated cells that perform specialized functions in the organism. Most life that can be seen with the naked eye is multicellular, as are all members of the kingdoms Plantae and Animalia (except for specialized organisms such as Myxozoa in the case of the latter).
Evolutionary history
Early life was most probably single celled and multicellularity has appeared dozens of times in the history of Earth.[1] In order to reproduce, true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (i.e. sperma and egg cells), an issue that is studied in developmental biology. Therefore, the development of sexual reproduction in unicellular organisms during the Mesoproterozoic is thought to have precipitated the development and rise of multicellular life.
Multicellular organisms also face the challenge of cancer, which occurs when cells fail to regulate their growth within the normal program of development.
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See also
References
- ^ Bonner, J.T. (1998) The origins of multicellularity. Integr. Biol. 1, 27–36