You seem to have a bunch of serious misconceptions. You need to know what it is you are critisizing before you jump in, guns blazing.
First of all, if a species has to unable to breed with it's parents(please remember when I say 'parents', I'm referring to the previous species), it would have to meet with another mutated form of the species that is mutated the same way it is. Otherwise it would never breed and the supposed 'better gene' that it carried would be lost.
This suggests that each step in evolutution has to be a species jump or something. Or anything with a mutation is a new species.
That is utterly, totally wrong!
You have mutations that your parents don't carry. We all do. Some may well be beneifial, that doesn't make you a new, incompatible species.
What happens is that these changes, which are in all individuals, can gradually over time pile up. Each individual is completely interfertile (same species) with ALL of the individuals alive at the same time as it is. However, if you took an individual and tried to breed it to an individual form 100,000 generations previous they might well not be successful. Or even want to mate (imagine your blind date as a H. eretus
). At each generation there is no problem. What you have described is no an issue it stems from your lack of understanding and that is all.
Also, advantagious mutations in animals more often than not are dissapated into the gene pool because they do NOT present a problem with breeding. Like dropping a drop of yellow dye into a lake, the animal would breed with another animal of the 'old' species, and the offspring would only have pieces of the advantage. So if it were true that God used evolution to create the world and all the animals in it, he would have to guide mutated creatures of his design to breed and carry the 'better gene' on and on, and on. Without this guidance, evolution would take amounts of time that God would have no control over. That is why I think that Evolution would have to be monitered by God if it created the world(which I once again state, I DO NOT believe in).
You are correct that genes will get lost in a population under some circumstances. In others they will become"fixed" because of some advantage they confir. This is simply fact. We might need another thread to go over the evidence though.
"Yellow dye" --- genes are discreet. They do not "water down" your analogy is false. If they confer an advantage they have a certain chance of spreading throughout the population. The guidedance that is supplied is selection.
This message has been edited by NosyNed, 02-02-2005 19:34 AM