I received an email asking about eye evolution.
hi dear myers, im a turkish student. i study EEE but i have a deep profound curiousity towards evolution. i know that you mastered in evo devo. even though i didnt read any of your books since i live in turkey and could not find them.. i wrote an article in my own way concerning evolution and tried to express my feelings. im learning english by myself, i didnt want to use translator so you can see my sincerity and effort. to be honest i just wanted to express my feelings and get some advices and opinions from you, im just confused..
Here is the article i have written:
That’s perfectly acceptable English, so he shouldn’t be shy. However, as you’ll quickly see, he seems to think “article” is a synonym for “paragraph”. It’s not much of an article. I agree, he’s confused.
One thing about evolutionary biology that concerns me and feels unable to perceive is cells and organisms acting like as though they know what to do when constructing an organ.
That’s a common and fundamental misconception, the reading of intent and purpose into a series of events. Cells don’t “know” what they are doing — their genes are responding in a mechanical way to the environment. So error #1: trying to impose teleology on the system.
although it happens through blindwatchmaker situation, i still cannot grasp. for instance, an eye is a complex system and it feels like even though some may say it is a trial and error state throughout the evolutionary process it seems it happened with permission of a creator..
“Complexity”…that always comes up, and it’s irrelevant. Chance processes can easily produce complexity, and trial and error is an effective (if wasteful) way to build an eye. Natural selection and drift don’t need permission. They happen whether you like it or not.
it is still unclear to me a system like an eye whether it can build itself in such a short amount of time. cells behave as if they know which part they contribute whenever building an immense and flawless eye.
What is a “short amount of time”? Developmentally, an eye assembles itself in hours, days, weeks, or months, depending on the species, using nothing but physics and chemistry, and no one has seen the finger of a deity coming down to nudge cells into place. Again, it’s not about the cells “knowing”.
Oh, wait, he means such a short amount of time on an evolutionary scale? Silly. I’ve seen a zebrafish eye assemble in less than 24 hours, so I’m not that impressed with an eye organizing over hundreds of thousands of generation. It’s pretty cool, don’t get me wrong, and there’s much to learn about the process taking place from the pre-Cambrian to 400 thousand years ago, but it’s not an intimidatingly difficult thing to accomplish. It’s well within the power of evolution, and we have examples of the intermediate steps.
some may say there are genes such as HOX which responsible for the case i mentioned, its still unclear to me ,since i approach the problems as a philosophical problem..by saying “approaching as a philo problem” i meant digging deeper the origins of it..
i hope i could transfered my inquiries…
Oh god. Everyone babbles about Hox genes even if they know nothing about them — this is a shortcut the writer is using to pretend to knowing something about molecular genetics. He doesn’t. You know, you could at least say Pax genes instead of Hox, since Pax is more directly relevant to eye development. Hox genes are patterning genes that define segment identity along the body (or limb) axis, while Pax genes are involved in tissue differentiation and organogenesis.
It’s especially bad to trot out the sciencey word “Hox” just before telling me you approach eye evolution as a “philosopphical problem.” I don’t care about your philosophy, I want to know about the material process, with evidence. Philosophy in this case is simply his efforts to make post-hoc rationalizations for his preconceptions — he’s giving philosophy a bad name.









