[js1138]

that gene is already doing an essential job for the organism and changing it will destroy the function it is performing and result in serious problems to the organism

Maybe sometimes true, but not relevant. Most of the DNA strand is non-functional -- left over from previous uses, but stored in the genetic attic. It is available for modification and re-use.

[gore3000]

Most of the DNA strand is non-functional

Wrong, absolutely wrong. I already posted proof showing that this evolutionist prediction is absolutely false in post#375.