Have a look a this web site by AIG that explains how the DNA works. I find it fascinating. The more I learn about it, the more I marvel at the Creator.
http://www.answersingenesis.org/creation/v25/i2/dna.asp
The DNA has a special mechanism that checks copied DNA for errors.
http://www.answersingenesis.org/creation/v25/i2/dna.asp
The DNA has a special mechanism that checks copied DNA for errors.
The accuracy and precision of copying is amazing. That is why the probability of evolution occuring is so low it is impossible.The letters of DNA have another vital property due to their structure, which allows information to be transmitted: A pairs only with T, and C only with G, due to the chemical structures of the basesthe pair is like a rung or step on a spiral staircase. This means that the two strands of the double helix can be separated, and new strands can be formed that copy the information exactly. The new strand carries the same information as the old one, but instead of being like a photocopy, it is in a sense like a photographic negative. The copying is far more precise than pure chemistry could manageonly about 1 mistake in 10 billion copyings, because there is editing (proof-reading and error-checking) machinery, again encoded in the DNA. But how would the information for editing machinery be transmitted accurately before the machinery was in place? Lest it be argued that the accuracy could be achieved stepwise through selection, note that a high degree of accuracy is needed to prevent error catastrophethe accumulation of noise in the form of junk proteins. Again there is a vicious circle (more irreducible complexity).