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Author Topic:   Definition of Life
Modulous
Member (Idle past 967 days)
Posts: 7789
From: Manchester, UK
Joined: 05-01-2005


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.

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.


This message is a reply to:
 Message 70 by Dr Jack, posted 05-14-2010 10:56 AM Dr Jack has responded

Replies to this message:
 Message 73 by Dr Jack, posted 05-16-2010 4:57 AM Modulous has responded

  
Modulous
Member (Idle past 967 days)
Posts: 7789
From: Manchester, UK
Joined: 05-01-2005


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.

It's from the conventional definition that RAZD posted above:

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.

This message is a reply to:
 Message 73 by Dr Jack, posted 05-16-2010 4:57 AM Dr Jack has not yet responded

  
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