Abdul Fattah
a.k.a. steve
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Re: The Eye - Evolution
I think that Azim’s point was that you cannot compare the two diffrent cases. For a virus to beneficially mutate, al it needs is a diffrent shape. For a human gene to beneficially mutate it needs a new order thus the ability to make new enzymes. The first is quite easy (in terms of probability) were as the second is not!
Well first of all these are all asumptions. As far as I know there is no record of eyeless creatures carrying inactive eye-genes. You’r more then welcome to prove me wrong on that of course. Secondly, these inactive genes (as illustrated in your example) is mostly the case of a characteristic (heavy bones/light bones) that some where along the way got lost by the creature, not the other way around. It’s true that in some cases these inactive genes can become active again, but there’s no reason to believe that this actually happend.
No, that’s were you’r wrong. Evolution does have to work from scrap. What you are suggesting: “evolution made inactive mutations ready inside genes so it could then when the time is wright mutate an eye” is not evolution! Most evolution-theorist would laugh that away as ID and creationist-theory.
Please take note that what you suggest goes against survival of the fittest, against the probability of the proces being random rather then regulated, against evolution.
Quite wright. Nonetheless if evolution wisches to pose as an alternative for creation, it needs to thouroughly show how you get from a single cell organism to a seeing creature, and even further then that.
I must be missing something, but the way you discribed it it does not serve as an intermediate system. It’s a single surculatory system with a secundairy source of air. It may serve as an intermediate form between gills and lungs, but it does not serve as an intermediate system between single circulatory and double circulatory systems. (see attachment)
I agree with you, it is mutational "Change" and "Change" in essence is Evolutionary change. So I fail to see your objection.
I think that Azim’s point was that you cannot compare the two diffrent cases. For a virus to beneficially mutate, al it needs is a diffrent shape. For a human gene to beneficially mutate it needs a new order thus the ability to make new enzymes. The first is quite easy (in terms of probability) were as the second is not!
This is the guts of our debate in reference to the Evolution of the human eyes. Firstly, I would like to express what mutation actually can be within evolutionary fields. Organisms carry an enormous arsenal of inactive genes and residual DNA. I think some of the mutations that we find that have resulted in beneficial changes occur when a gene that was once active and beneficial millions of years ago for an ancestor with a different niche becomes active again and provides a new advantage now that the organism has again changed environments.
Well first of all these are all asumptions. As far as I know there is no record of eyeless creatures carrying inactive eye-genes. You’r more then welcome to prove me wrong on that of course. Secondly, these inactive genes (as illustrated in your example) is mostly the case of a characteristic (heavy bones/light bones) that some where along the way got lost by the creature, not the other way around. It’s true that in some cases these inactive genes can become active again, but there’s no reason to believe that this actually happend.
Evolution does not have to create from scratch and it rarely does. We have to bear in mind that ALL LIFE SHARES A BIG GENETIC MATCH.
No, that’s were you’r wrong. Evolution does have to work from scrap. What you are suggesting: “evolution made inactive mutations ready inside genes so it could then when the time is wright mutate an eye” is not evolution! Most evolution-theorist would laugh that away as ID and creationist-theory.
Please take note that what you suggest goes against survival of the fittest, against the probability of the proces being random rather then regulated, against evolution.
If we now go back to known evolutionary beginnings then firstly (and I do not know myself) why does it have to be a single celled organism that developed light sensitive cells. At this stage so early in the evolution of life, the development of light sensitive cells is a chemical mutational change that could easily have occured in early multi-cellular life. Secondly, early light sensitive cells are not yet "eyes" but the ability to react to light will bring a massive evolutionary advantage and would quickly come to dominate nearly all life. From here time and adaptation will do the rest. Eyes would have been at an advanced level well before the very first fish started to occupy dry land.
Quite wright. Nonetheless if evolution wisches to pose as an alternative for creation, it needs to thouroughly show how you get from a single cell organism to a seeing creature, and even further then that.
OK, here is an intermediate stage:
An ancient family of fish thought to be the direct ancestors of land vertebrates takes this adaptation one step further. The three living lungfish, one in each of Australia, Africa and South America, live in muddy streams that are prone to drying. Oxygen levels are low and the fish must sometimes burrow in the mud to survive droughts. Clearly, gills are not the best respiratory surfaces under such circumstances. The lungfish have adapted the swim bladder as a lung by diverting the artery from the sixth gill arch directly to it. Thus it receives deoxygenated blood under fairly high pressure. The vein returning from the lung then adds oxygenated blood to the heart, reducing the amount of oxygen that must be picked up in the gills.
I must be missing something, but the way you discribed it it does not serve as an intermediate system. It’s a single surculatory system with a secundairy source of air. It may serve as an intermediate form between gills and lungs, but it does not serve as an intermediate system between single circulatory and double circulatory systems. (see attachment)
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