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Author Topic:   Single Celled to Multiple Cellular evolution
ramoss
Member (Idle past 688 days)
Posts: 3228
Joined: 08-11-2004


Message 1 of 10 (508466)
05-13-2009 6:46 PM


What is the evidence on how singular cell organisms evolved into multicellular
organisms? Was this before or after the plant and animal kingdoms split.
And is there surviving evidence on the evolution of the spinal column ?

Replies to this message:
 Message 3 by Dr Adequate, posted 05-14-2009 4:03 AM ramoss has replied
 Message 4 by Dr Jack, posted 05-14-2009 7:31 AM ramoss has not replied

  
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Message 2 of 10 (508468)
05-13-2009 8:41 PM


Thread moved here from the Proposed New Topics forum.

  
Dr Adequate
Member (Idle past 361 days)
Posts: 16113
Joined: 07-20-2006


Message 3 of 10 (508475)
05-14-2009 4:03 AM
Reply to: Message 1 by ramoss
05-13-2009 6:46 PM


We can actually watch evolution from single-celled forms to multi-celled forms happening.
Linky link.

This message is a reply to:
 Message 1 by ramoss, posted 05-13-2009 6:46 PM ramoss has replied

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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003


Message 4 of 10 (508485)
05-14-2009 7:31 AM
Reply to: Message 1 by ramoss
05-13-2009 6:46 PM


Plants and Animals evolved multicellularity separately (as did red, green and brown algae, certain bacteria and fungi).
The evidence that multicellular organisms evolved from singlecelled organisms comes from multiple similarities of genetics and biochemistry between them.
As for the spinal column, evidence comes both from extant variations on the notocord, some fossils (such as Pikaia - the first known chordate) and the development of embryos.
Edited by Mr Jack, : Markup fix.

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ramoss
Member (Idle past 688 days)
Posts: 3228
Joined: 08-11-2004


Message 5 of 10 (508522)
05-14-2009 2:59 PM
Reply to: Message 3 by Dr Adequate
05-14-2009 4:03 AM


I take it the next step would be for individuals to become more specialized in a colony??

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 Message 3 by Dr Adequate, posted 05-14-2009 4:03 AM Dr Adequate has not replied

Replies to this message:
 Message 6 by OriginLifeandDeath, posted 05-14-2009 9:32 PM ramoss has replied
 Message 10 by straightree, posted 05-17-2009 4:20 PM ramoss has not replied

  
OriginLifeandDeath
Junior Member (Idle past 5502 days)
Posts: 9
Joined: 05-14-2009


Message 6 of 10 (508573)
05-14-2009 9:32 PM
Reply to: Message 5 by ramoss
05-14-2009 2:59 PM


single cell to multi cell shown as de-evolution
Edited by Adminnemooseus, : Hide content, add banner.

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 Message 7 by ramoss, posted 05-14-2009 10:10 PM OriginLifeandDeath has replied

  
ramoss
Member (Idle past 688 days)
Posts: 3228
Joined: 08-11-2004


Message 7 of 10 (508585)
05-14-2009 10:10 PM
Reply to: Message 6 by OriginLifeandDeath
05-14-2009 9:32 PM


Re: single cell to multi cell shown as de-evolution
This has nothing to do with what I was asking, and looks to be preaching instead of looking at the issue.
Edited by Adminnemooseus, : No reason given.

This message is a reply to:
 Message 6 by OriginLifeandDeath, posted 05-14-2009 9:32 PM OriginLifeandDeath has replied

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OriginLifeandDeath
Junior Member (Idle past 5502 days)
Posts: 9
Joined: 05-14-2009


Message 8 of 10 (508586)
05-14-2009 10:16 PM
Reply to: Message 7 by ramoss
05-14-2009 10:10 PM


Re: single cell to multi cell shown as de-evolution
If facts sound like preaching I am sorry.
Edited by Adminnemooseus, : No reason given.

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Coyote
Member (Idle past 2182 days)
Posts: 6117
Joined: 01-12-2008


Message 9 of 10 (508592)
05-14-2009 10:38 PM
Reply to: Message 8 by OriginLifeandDeath
05-14-2009 10:16 PM


Re: single cell to multi cell shown as de-evolution
If facts sound like preaching I am sorry.
It sounds like you're flogging a self-published book with massive internet posting.
If you had facts and worthwhile theory you could get published in a peer-reviewed journal.
Have you tried the creationist websites? They might be more interested.
Edited by Adminnemooseus, : No reason given.

Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.

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straightree
Member (Idle past 4827 days)
Posts: 57
From: Near Olot, Spain
Joined: 09-26-2008


Message 10 of 10 (508961)
05-17-2009 4:20 PM
Reply to: Message 5 by ramoss
05-14-2009 2:59 PM


I take it the next step would be for individuals to become more specialized in a colony?? .
Indeed.
One of the best known examples of colonies, still living in our present day is alga Volvox. Flagellated single cell individuals form colonies, that move by flagellum propulsion. The cells that are in one pole of the colony specialize in directing movement, using photo sensible spots. The ones in the opposite pole specialize in reproduction. A very common pattern, to be found in most animals, though algae are not in the line of animal evolution, but plants!
To find more about Volvox, see this Wikipedia page Volvox - Wikipedia

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