PBS recently ran Nova's 'What Darwin Didn't Know' - your local PBS station may run it again and it's worth watching. There are four hours of great visuals and insightful information to bring you up to speed on the current state of genetic research as it relates to the genetic traits in all types of animals. But two problems became readily apparent:
1. The narration and some speakers use "evolution" where in many cases it's clearly more appropriate to use "adaptation" (any instance where a change may be naturally and beneficially reversed is clearly adaptation), such as fur color in mice.
2. Rather than pursuing an objective conclusion, the show sticks to a dogmatic evolutionary perspective. To be fair, they set the expectation that they are referring everything back to Darwin. Alas, that turns out to be strictly titular.
The premise is that Darwin was much more right than he ever could have imaginged. However, that thinking leads the narrative down an ever-narrowing perspective, whereas the information presented actually opens up much broader possibilities.
Here is an alternate, and much more open-minded interpretation of the data:
Suppose you were God. As such, you are much smarter than humans - much, much smarter. If you were to design and build cars, for example - you probably would not start over with every design and give every model a different engine, steering mechanism, cabin layout, etc. You would probably take a couple of basic platforms (think car vs. truck), a few efficient, powerful engines (possibly running on different fuels) and a smattering a mechanical components, interior pieces and safety equipment to build many models of vehicles. In the case of DNA, you would have a collection of 23,000 genes representing 3 Billion possible specifications.
If your list of possible options included (for the sake of giving us a wide perspective) tracks and a turret for a tank, you wouldn't need to build a separate plant or scrap your parts list just because your 2-seat hybrid model didn't require those items. OK, you're smart. You have one list of parts with millions of possibilities. You never have to reinvent cars from scratch - a simple genetic 'switch' lets you turn of the 'armament' section of the common genetic code.
As a result of this process, you might end up with some oddball artifacts like rear seat belts for seats too small for anyone to ever want to occupy. You might even see a place for a spare tire on a model with run-flat tires. You would surely have cargo hooks on some cars that were never loaded on a cargo ship. Of course unlike cars, your product produces offspring which begets the opportunity for adaptation and the results range from Hummer limousines to drop-top Mini Coopers.
Achieving such a feat of genetic creation is not only brilliant, it means you can knock of early and go get a beer. It also means that you can let nature run its course, producing lots of variations. The four-door Toyota pickup can be seen worldwide and Pontiacs go extinct. People will marvel at a restoration of a Model T Ford, but no one will declare that cars are the decendants of horses (you hope).
Here's the problem with strict Evolutionist thinking - in order to maximize the acceptance of evolution, you have to downplay the power of Adaptation. In other words, everything must change in one direction only - from simpler to more complex - to explain how humans are the eventual desscendants of single-cell organisms.
If anyone were to insist that Demotic Egyptian, Hierogliphics and Greek were derived from each other sequentially because all three appeared on the Rosetta Stone, the presumption would quickly be discarded. In the same way, the fact that a whale has pelvic bones doesn't have to mean that it was once a land animal or that land animals evolved from it. It only means that the use of a universal genetic code or a common 'parts bin' results in occassional vestigal items.
And now the bigger problem.
If you dismiss the possibility of universal genetic code as the source of common genetics, you inherently presume that the first and simplest creature had, from its very origination, the genetic architecture for humans. Plants came first and were simpler, you say? No, no - plants have 80,000 genes to animals' 23,000. Such a presumtion would require, I don't know... some intelligence behind the original design? You can't have that.
Darwin's observations of the Adaptation of species were absolutely correct. His rejection of the Victorian era idea that all creatures existed just as they had been created by God without change was perfectly rational. But just as theories built on his work have been refined, Creationist thinking has broadened as well. Evolutionists want to trumpet the superiority of their theory over long-abandonded Victorian Creationism, but current genetic science merits a fresh look the assumptions required by evolutionism.
That objective thinking may lead to some fascinating possibilities - for those whare are not bound by the narrow perspective of strict Evolution.
edits Jan.4 - spelling erros fixed, deleted word, bold/underline for links, especially beer