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...something resembling a blueprint (as in serving as a model or providing guidance); especially : a detailed plan or program of action
The Primary Axiom is that man is merely the product of random mutations plus natural selection.
It's understandable that biology would only concern itself with life once it's emerged.
But with evolution, which is modelled on ancestors and lineages and phylogenetic trees and such, you can't ignore what the very first instance of life was.
And naturally one might then wonder what the previous ancestor to that was, and so on.
Why do we consider life to be nothing but chemistry, but then ignore that same chemistry when it comes to how life came to be?
If evolution simply means change over time, then that means I evolve when I go up to higher altitudes, from the biochemical alterations that occur to adjust to the varying oxygen levels. Surely that is not evolution.
originally posted by: rnaa
a reply to: cooperton
So yes, it is theorized that RNA organisms came first
No it isn't.
It is HYPOTHESIZED that RNA organisms came first.
There is no theory of abiogenesis, and there may never be one.
originally posted by: rnaa
A key word there is population. In Biology, evolution refers to the changes over time in POPULATIONS, not individuals. So you going up a mountain and experiencing temporary changes to your body chemistry is NOT biological evolution, because you are an individual, not a population.
originally posted by: Barcs
You are confusing 2 different hypotheses here. Abiogenesis and RNA World hypothesis are not the same thing, plus both are unverified and unproven in science. It could only be considered evolution if RNA already had most of those features, and then life slowly evolved so that the earlier simpler RNA eventually became the complex DNA we see today.
I tend to agree with that version, but the OP is talking about the emergence of certain features necessary for replication and evolution. This falls into the abiogenesis category.
He is not asking how RNA evolved into DNA, he's specifically referring to how certain features and functionality of RNA/DNA first emerged. Without the functions he refers to, evolution could not occur, so they couldn't be the results of evolution. Natural selection and environment pressure, sure. Evolution... no.
originally posted by: rnaa
But Biology DOESN'T 'only concern itself with life once it's emerged'. Biology has an active subdiscipline that concerns itself with the question of how life emerged from the pre-biotic envirenment. Its called Abiogenesis.
originally posted by: rnaa
You can ask questions about it that can be answered and the answers can be verified. You don't need to know whether life was created by a supernatural being or a lightning strike in a mud puddle or a chemical soup near a thermal sea vent to ask questions about how a wing developed.
originally posted by: rnaa
Who is ignoring it? Your question honestly makes no sense to me.
originally posted by: rnaa
PhotonEffect gave a more precise definition that I did: "the biological definition of evolution is more technically known as a shift in allele distribution/frequencies within a population."
A key word there is population. In Biology, evolution refers to the changes over time in POPULATIONS, not individuals. So you going up a mountain and experiencing temporary changes to your body chemistry is NOT biological evolution, because you are an individual, not a population.
Fact: DNA as it is found in the genomes of living organisms IS a code/blueprint.
originally posted by: cooperton
I can score on a stationary goal post, but if the theoretical framework is shifted away every time I present a logical impossibility, there is nothing I can do.
One of the problems with evolution is that it leaves a very HUGE leap for abiogenesis to manifest the first viable cell.
Do you really think no intelligent faculty was involved in the generation of the simplest possible bacteria: Machinery Involved in the Simplest Microbe
Even once this is accomplished, evolution is constantly presented with the chicken-or-the-egg paradox...
How can a gene and the necessary regulators for said gene evolve simultaneously?
How can a gene and the necessary regulators for said gene evolve simultaneously?
originally posted by: Barcs
THIS IS NOT EVOLUTION.
A TATA box is a DNA sequence that indicates where a genetic sequence can be read and decoded. It is a type of promoter sequence, which specifies to other molecules where transcription begins. Transcription is a process that produces an RNA molecule from a DNA sequence. The TATA box is named for its conserved DNA sequence, which is most commonly TATAAA. Many eukaryotic genes have a conserved TATA box located 25-35 base pairs before the transcription start site of a gene. The TATA box is able to define the direction of transcription and also indicates the DNA strand to be read. Proteins called transcription factors can bind to the TATA box and recruit an enzyme called RNA polymerase, which synthesizes RNA from DNA.
originally posted by: cooperton
[back to discussing evolution]
How can a gene and the necessary regulators for said gene evolve simultaneously?
Genetic alteration is the basis for the theory of evolution.
All I am asking you: "How can a gene, which will not work without its specific regulators/promoters, simultaneously evolve at the same time as its regulatory mechanisms?" As if one beneficial mutation wasn't unlikely enough, you'd need a whole host of them to synchronize a functioning effect.
Where's the evidence that random mutations and natural selection can give a DNA sequence meaning and function that regulates gene expression?