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Author Topic:   Is Evolution Reversible
Dr Jack
Member (Idle past 184 days)
Posts: 3507
From: Leicester, England
Joined: 07-14-2003


Message 46 of 49 (511526)
06-10-2009 5:53 AM
Reply to: Message 38 by Dr Adequate
06-07-2009 7:20 AM


Chromosome loss
A chromosome loss would be almost impossible to survive unless it was a duplicate of another chromosome.

Hmm... not sure about that. Humans have 46 chromosomes, but we almost certainly evolved from animals with 48 (given that Gorillas, Chimps and Orangs all have 48).


This message is a reply to:
 Message 38 by Dr Adequate, posted 06-07-2009 7:20 AM Dr Adequate has responded

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 Message 49 by Dr Adequate, posted 06-11-2009 3:54 AM Dr Jack has not yet responded

  
Larni
Member
Posts: 3975
From: Liverpool
Joined: 09-16-2005


Message 47 of 49 (511528)
06-10-2009 6:40 AM
Reply to: Message 45 by Wounded King
06-10-2009 5:35 AM


I'm not sure that 'loss' in this case is really what happened.

Yeah, see you point; I did not word that very well. What I think I meant to say was that sabre teeth come and go over time, rather than evolution having to 'go backwards'.

Now I think I'm starting to confuse myself.


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FliesOnly
Member (Idle past 2224 days)
Posts: 797
From: Michigan
Joined: 12-01-2003


Message 48 of 49 (511530)
06-10-2009 7:35 AM
Reply to: Message 46 by Dr Jack
06-10-2009 5:53 AM


Re: Chromosome loss
Mr Jack writes:

Hmm... not sure about that. Humans have 46 chromosomes, but we almost certainly evolved from animals with 48 (given that Gorillas, Chimps and Orangs all have 48).

But remember, we didn't actually lose a chromosome pair. Instead, we have 46 (not 48) because of a fusion event, not a loss.
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Dr Adequate
Member
Posts: 16086
Joined: 07-20-2006
Member Rating: 10.0


Message 49 of 49 (511666)
06-11-2009 3:54 AM
Reply to: Message 46 by Dr Jack
06-10-2009 5:53 AM


Re: Chromosome loss
Hmm... not sure about that. Humans have 46 chromosomes, but we almost certainly evolved from animals with 48 (given that Gorillas, Chimps and Orangs all have 48).

That's not a loss, that's a fusion.

Chromosome 2. An article so profound in its intellectual brilliance that I can only say ... I wrote it.

Edited by Dr Adequate, : No reason given.


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