@Socrates4Jesus
Agreed. Selection pressures (or Charles Darwin’s hypothesis of natural selection) certainly does help explain one way that the DNA of living organisms change over time. This, however, is not what we are considering. We are considering whether the your idea of selection pressures explains how the genetic code for the first living organisms was created."
“Well, whether it will remain to be unknown to you or i remains to be seen! How the first genetic code was created is the very question you and i are considering. That is, is it possible to create the genetic code without the aid of some intelligent being?”
There are a number of things here that would require defining, S4J. From what I’ve read, to pick out what was the first ‘living’ organism would be quite difficult. About as difficult as picking out the precise point where we humans became a different species from the homonid that preceded us, if a representative from every generation was to stand in a line. Somebody at our modern end may be able to successfully mate from somebody around the middle, that middle person may be able to mate with the person at the end, but the modern person and the ancient one would be too far ‘apart’ genetically. It is not quite as cut and dry as new species/same species. For modern examples that illustrate this, look up “ring species”
I suspect that the beginning of life might be equally difficult to quantify. When do we decide it is ‘life’? Is it as simple as a self catalising, and hence self-replicating, molecule? There are numerous examples of such molecules, and they are not neccesarily ridiculously complex. However, once there IS a self replicating molecule, selection pressures can come into effect if the replication is good, but not perfect. This is all that is required to get things going, and this comes before “genetic code”, so in a word “yes”
A’s selection pressures can explain genetic code in the form of DNA, but is it a living organism yet?
Is it after the self catalysing molecule has been surrounded by molecules that are attracted to water on one side and repelled by it on another, effectively forming a wall around it, thus creating the first distinction between inside and outside, the first ‘me’ and ‘you’ or from a chemical perspective ‘us’ and ‘them’. This was a simple cell, which was an environment that allowed the self-replicating molecules to replicate better than other molecules floating around free in the ocean. Many kinds of molecules form spherical shapes in water, but is it a living organism yet?
This is still pre-DNA, with much simpler replicators, probably RNA. But the ball is already rolling.
Do you require the cells to be Eukaryotic (have the genetic material walled off from the rest of the cell in another internal compartment) to consider it a living organism? Do you require that the cells harness bacteria in the form of mitochondria or chloroplasts and incorporate their chemical reactions for the benefit of the cell before you consider it life? Do you consider a virus to be alive?
Darwin’s THEORY (not hypothesis, let’s not cheapen the discussion by such wordplay, please) of Evolution by Natural selection can cope just fine from here, but has nothing to say about how the first ‘life’ arose.
The problam at hand is not to explain how
poof a Tyranosaurus Rex jumped out of the water one day with a fully fledged DNA-based genome, it is to try to find out exactly what those first simple self-replicating molecules were, and what conditions were required to allow them to form. This kind of hypothesis is one that can be tested and falsified. What sort of testing and falsification does your hypothesis subject itself to? Note I am not required to believe either hypothesis until there is enough evidence to support it, but what I have presented doesn’t fly in the face of any established theory and it isn’t a hypothesis that was plucked from the clear blue sky. Instead it builds on what we already know.
What do you think DNA is? What do you think the letters A, C, G and T stand for? They aren’t a language unto themselves, they are the first letters of particular molecules Adenine, Cytosine, Guanine, and Thymine. In a ridiculously extreme nutshell, having these monomers in different orders catalyses different chemical reactions, which accounts for how our bodies end up being built, and at least some portion of our behaviour, which in turn dictates on average how much we end up mating and replicating again.
I too have merely scratched the surface, but I am always reading more, it is a fascinating process regardless of whether God exists, but there is no need to put a God in the gaps in understanding here either.