Thanks for your kind reply - I can see that definition’s are going to be key - I was (probably incorrectly) using the term Macro-Evolution to refer the change of one species into another - such as a fish into an amphibian. I agree with you that species frequently reach a point where they can no-longer interbreed. Where I would disagree is that I don’t see evidence of organisms developing new and beneficial genetic traits - that didn’t already exist in the gene pool - through natural selection.
In order for natural selection to develope a more complex organism it must have the ability to get significant benefits out of a progressive series of small changes to the genetic code. This presents a problem since the genetic code is much like a computer code and many base pairs would have to be changed to code for a new beneficial protein. If only some of those base pairs are changed correctly the changes would not provide any benefit and thus not be supported by natural selection.
Where I would disagree is that I dont see evidence of organisms developing new and beneficial genetic traits - that didnt already exist in the gene pool - through natural selection.
I agree with you, that is, I also do not see evidence of organisms developing new and beneficial genetic traits previously nonexistent through natural selection. Natural selection can only select for what's already in existence. To create "something new," a mutation is required.
Good programs are written in many small modules. A change to one can make a program suffer or perform better, or do little or nothing to the functioning of the overall program. The function of a module often does change to essentially become a new feature. And often change over time becomes so much that the interface between the newest module (that's in the latest version of the program) and the old, original program doesn't work anymore (speciation).