tkmmorgan,
It is true that genetic mutations can be fatal or harmful, and this is the case in the majority of genetic mutations. But there are beneficial mutations. The point about the flu virus, or antibiotic-resistant bacteria is that they have definitely mutated and the genetic mutation has been beneficial for their survival (not so beneficial for us). Since bacteria and viruses reproduce so quickly, they go through a lot of mutations. Most of the mutations are either harmful or have no affect... but some help the organism to be better adapted to it's environment.
In fact, scientists CAUSE mutations in organisms in the lab. A simple expiriment is done in which bacteria is cultured on two separate dishes. One dish is exposed to radiation as the bacteria reproduce, causing a greater frequency of genetic mutations and the other dish is left alone. After several (hundreds, thousands?) generations both dishes are exposed to an antibacterial agent. Guess which dish has some living bacteria at the end of the trial?
Think about that and how that relates to beneficial genetic mutations.
No... small mutations like that don't make a new species, but with natural selection, they can cause a certain individuals within a population to be more successful. Those more successful individuals reproduce more and cause their genes to be more abundant within the population. If this population is split geographically, then the genetic information within both populations can diverge... and over time they can diverge to the point in which the populations no longer sexually reproduce with each other. This is an example of speciation and it takes time. This has been specifically observed.
The only thing that has not been specifically observed, but there is overwhelming evidence for it, is 'macroevolution'. The argument that it cannot be directly observed, thus it cannot be proven is not valid because we have plenty of indirect evidence of it. (Not everything in science is based on direct observations... but when you have several independent pieces of indirect evidence suggesting the same thing, then the theory becomes solid). A case in point is that no one has ever witnessed a mountain range forming, but we know exactly how it happened... due to continental drift and plate techtonics. Building mountain ranges is an extremely slow process, as is 'macroevolution'. We don't disbelieve continental drift because it's too slow to notice. Many many tiny, almost immeasurable 'micro-events' build up over time to one 'macro-event' - the building of a mountain.
Continuing on with the analogy with continental drift... you may say, "well we know continental drift is true because we can actually measure how fast the continents are moving in relationship to one another with sophisticated satellite technology." This is true... and it is the same as saying, "we know that macroevolution is true because we can actually measure how fast genes change within populations and calculate back the time when species and higher level groups diverged... and this is independently verified by fossil evidence which shows the bush-like evolution of life in the rocks. So we can infer that the tiny genetic changes that happen in populations today (microevolution) ammount to large changes over great stretches of time (macroevolution) - just like continental drift."
There is no reason to believe that genetic change was any different in organisms thousands and millions of years ago than it is today... so there is plenty of time for the genes to branch and split into the type of life we see today. Otherwise you have to explain some type of stasis that keeps genes from mutating over millions of years, and so far there hasn't been any mechanism found to explain such a thing. Mutations are a normal and common part of reproduction.
For me, it's simple: if you dig into the dirt, you see fossils of ancient animals. These animals are a lot different than life today. So you have a couple of options (maybe more). 1) God created all this life and then decided he didn't like it and destroyed it all and created new modern life forms (and he did this many times as shown in the fossil record). Or 2) Life evolved over time and survived through several extinction events which gave certain organisms advantages over others (mammals over dinosaurs) and that is why modern life-forms are different from ancient ones.
You have to explain it somehow because there haven't been any Trilobites in a long long time . To me, the expirimenting god explanation is just silly, and the evolutionary explanation, in addition to fitting all of the observed facts, just makes sense.
rem
Edited by - rem on 27 September 2002 17:50:41