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Author Topic:   Can sense organs like the eye really evolve?
jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


(3)
Message 5 of 242 (636398)
10-06-2011 9:02 AM
Reply to: Message 1 by ANI
10-06-2011 8:39 AM


no brain needed.
Hi ANI, Welcome home.
I think some pastor or minister or teacher mentioned that to you and at first glance it seemed reasonable, but of course it is utterly wrong.
Stop and think for a moment.
Plants sense light and respond, yet they have no brain.
Many bacteria sense light and respond, yet they have no brain.
A brain is simply not needed and in fact what we see is yet another example of just what the Theory of Evolution predicts.

Anyone so limited that they can only spell a word one way is severely handicapped!

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 Message 1 by ANI, posted 10-06-2011 8:39 AM ANI has not replied

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jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


(1)
Message 12 of 242 (636433)
10-06-2011 1:35 PM
Reply to: Message 11 by Blue Jay
10-06-2011 1:31 PM


towards a brain
And that is another great piece of evidence supporting the Theory of Evolution.
Just as when we look at life around us we can find just about all the steps from simple light sensitivity to eyes, we can find all the various steps that lead to a brain.

Anyone so limited that they can only spell a word one way is severely handicapped!

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 Message 11 by Blue Jay, posted 10-06-2011 1:31 PM Blue Jay has seen this message but not replied

  
jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


(1)
Message 21 of 242 (636472)
10-06-2011 6:44 PM


The vast majority of life has sense organs and no brain.
If we look at the life around us what we see is that almost all life forms have sense organs but no brain. The next largest group have sense organs but no central brain and either just nerve networks or decentralized computing centers. It's only a fairly small subset of life forms, all limited to just one Kingdom and even there the existence of a brain is not universal.
What we do find though is exactly what the Theory of Evolution predicts; we find that critters have evolved a whole set of solutions to address the issue of sensory detection.
The really important thing is that all of these various critters are a great blueprint of how various systems did evolve. Even if there were some other model that was available, and there is none, it would be hard to even imagine a better explanation than what is seen in the Theory of Evolution that explains the FACT that evolution happened.

Anyone so limited that they can only spell a word one way is severely handicapped!

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jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


Message 39 of 242 (636561)
10-07-2011 2:53 PM
Reply to: Message 38 by Coragyps
10-07-2011 2:40 PM


Trilobite
And IIRC (but I'm old and so forgetful) there were three totally different major types of eyes in the trilobites with about a half dozen each variations within each type.

Anyone so limited that they can only spell a word one way is severely handicapped!

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 Message 38 by Coragyps, posted 10-07-2011 2:40 PM Coragyps has not replied

  
jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


Message 94 of 242 (637681)
10-17-2011 12:29 PM
Reply to: Message 91 by Big_Al35
10-17-2011 11:55 AM


Lasik defeats evolution? NOT!
I'm sorry but that is not only a false statement and an irrelevant statement, also just plain silly.
Lasik surgery has NOTHING to do with whether or not humans are evolving.
From an evolutionary point of view, vision was only relevant if the vision would have been so bad that it would have kept the human from living long enough to reproduce.
Try thinking of some other example that is not quite as sophomoric.
Second, your example would not stop evolution, it would simply allow the increased likelihood of genetic defects that affect eyesight to get passed on, assuming some genetic defect that is so bad that it would have kept the human from knocking up some other human or from getting knocked up, and right off hand I cannot think of a vision defect so bad that it would keep a girl from getting knocked up.
Is that example really the best one you can come up with?

Anyone so limited that they can only spell a word one way is severely handicapped!

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 Message 91 by Big_Al35, posted 10-17-2011 11:55 AM Big_Al35 has not replied

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jar
Member (Idle past 394 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004


Message 106 of 242 (637730)
10-17-2011 5:09 PM
Reply to: Message 105 by Dogmafood
10-17-2011 4:57 PM


Big_Al and Rabbit Holes.
More to the point, what the hell does it have to do with the topic?

Anyone so limited that they can only spell a word one way is severely handicapped!

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 Message 105 by Dogmafood, posted 10-17-2011 4:57 PM Dogmafood has seen this message but not replied

  
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