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Definition of Life

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Author Topic:   Definition of Life
Modulous
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Posts: 7801
From: Manchester, UK
Joined: 05-01-2005

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Message 72 of 77 (560473)
05-15-2010 12:04 PM 		Reply to: Message 70 by Dr Jack
05-14-2010 10:56 AM

Re: A Simple Definition of Life ...
The trouble with any definition of life that includes reproduction is that excludes the many examples of things we'd call alive but don't reproduce: the sterile, the elderly and the unlucky.
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When it comes to multicellular organisms the definition says it can be broadly applied to include growth/development (ie cells dying and new cells being generated). The elderly are still hotbeds of reproducing cells, even if they lack any viable germ line cells.
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 Message 70 by Dr Jack, posted 05-14-2010 10:56 AM Dr Jack has replied
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 Message 73 by Dr Jack, posted 05-16-2010 4:57 AM Modulous has replied
  
Modulous
Member
Posts: 7801
From: Manchester, UK
Joined: 05-01-2005

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Message 74 of 77 (560579)
05-16-2010 8:59 AM 		Reply to: Message 73 by Dr Jack
05-16-2010 4:57 AM

Re: A Simple Definition of Life ...
What definition is that? Including growth and simple cell replication in reproduction is a very non-standard notion of reproduction, indeed.
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It's from the conventional definition that RAZD posted above:
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quote:
Reproduction - The division of one cell to form two new cells is reproduction. Usually the term is applied to the production of a new individual (either asexually, from a single parent organism, or sexually, from at least two differing parent organisms), although strictly speaking it also describes the production of new cells in the process of growth.
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