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Along with the conversation with my doctor friend was a Discovery channel program referencing this info.
DNA degrades is probably a poor choice of wording here..as I am not an expert.
The components and interactivities that make up the DNA is where the discovery was made...and with that the re-writting capability of the helix.
The program reffed factors which should cause the chromosome pattern to mutate...other components where reffed to be vulnerable to degredation..thus the interest in why the Human DNA chromosome pattern did not mutate into something else over time...thus nulifying Human reproduction.
I taped the program..but did not mark it..hpoefully I did not tape over this program
The program nearly made my Jaw drop..there was animated sequences that showed how the DNA sends signals to the cells to go active and then shut down at certain intervals in the fetus development.
Cells sending chemical messages...cells migrating...activating Heart growth..then limbs..then respitory..etc...it was wild.
And in all of this...if at just one point there is a mutation that sends the cell activation out of sequence..you have a mutant human being.
They showed chromosomes...showed them dancing...pairing up..moving apart.
They showed chromosomes activating in some parts of the body..and being inactive in other parts....like a computer program.
This dance pattern..and the initiation of sequences when cells touched each other was awesome..and yet..the cells would interact with each other and no activity would generate...like the time sequence info was withheld.
Am not an expert in this..hope my semi-confusing post helps...
Either way..am not pulling your leg about the DNA internal degredation..and the self re-writting thing is true too.