In college, I was a physics major. In physics, we sought to provide some
precise answers to specific data presented to us. For example, we know that a
car turning a corner must rely on a certain amount of friction to turn a corner.
We want to know how to calculate this so we can set safe speed limits on
corners. In chemistry, we seek to know just what is happening when iron rusts or
an acid and a base are combined. In medicine we seek to know exactly why someone
who suffers from Sickle cell disease. Doctors have traced the problem back to a
single DNA point mutation which then changes the coding of a single amino acid.
1
This is pure science, seeking to find an answer while examining the details.
Of course, not all science can be done in this way. There are fields such as
plate tectonics that take observed data and use them to create models of how the
different plates of the earth's crust will affect each other. Still, these
models attempt to be very specific in just what is moving and how, and it's this
specificity that makes the difference in the explanatory value of any theory.
The devil's in the details, as it were.
What's Needed to Make a Whale
Yet, when I talk with proponents of evolution, the discussions are different.
Yesterday, I engaged again in an exchange with a proponent of evolution. I asked
his again to provide a definition, to which he replied "Evolution Is Change in
the Inherited Traits of a Population through Successive Generations" (borrowing
the title from
this web site.) But,
as I wrote yesterday, that's not a very useful definition. Just because
things change doesn't mean we get new biological systems. Men can be four feet
tall or seven feet tall, but not 12 inches tall or 12 feet tall. Those who
inherit the sickle cell trait are immune from malaria, but their children are at
risk of a painful life and an early death. Even here, the inherited immunity
isn't a new feature, but a crippling of a functioning system.
So, I ask for
specifics. I offered the humpback whale as an example. Supposedly, the whale
evolved from a land mammal over the course of about 10-12 million years.
2
One may try to explain the size increase by simple growth over time, (although a
recent article in
the journal Science says that such an explanation fails), there are still a huge
amount of systems that must be changed for a land-dwelling mammal to change into
an ocean-dwelling one. The nose must be migrated to the top of the head and
turned into a blow hole. Breathing is no longer automatic but must take
conscious effort. Walking limbs must be transformed into flippers. The kidneys
must be changed to handle the intake of salt water. Testes must be located
inside the body to keep warm. The young must be able to nurse under water, and
on and on.
3
How Much Change Does that Take?
You may imagine that changing one body part into something different, like a
nose into a blowhole would take quite a bit of DNA rearrangement. These
morphological changes not only have to all happen, but they have to happen
together, for a blowhole isn't going to help if you are breathing without
thinking. The animal will simply drown. But even more problematic, the vast
number of changes to the DNA must happen within that relatively short window of
10-12 million years because that's what the fossil record shows. If whales came
from the land mammal pakicetus, then using the traditional dating of fossils
found, all these changes must take place with what would be on an evolutionary
timeline, a very brief span.
Thu, my question to my interrogator was simple
how quickly would the mutations of DNA have had to happen to produce all of the
necessary changes to get the whale from its supposed ancestor? Does any natural
selection and genetic mutation that we observe now correlate to those changes?
One must remember that we aren't taking about bacteria that reproduce very
quickly and have very large populations. Mammals like pakicetus are the same
size as a large dog, which means that they might reproduce only after a year or
two upon maturation and produce a few litters. With a smaller population and
more time between generations, evolution via mutation is made even more
difficult.
So, what's the model? Where's the math? What's the actual number
of beneficial mutations posited generation to make this kind of a transition? I
was met with nothing but obfuscation. It was all hand-waving, and talk of me
supposedly ignoring "hundreds of years of hard scientific work." This is what I
find all the time in discussions of evolution. Everyone claims it's an
established fact, but no one offers the details. Dawkins speaks of cells that
morph into light-sensitive ones, then become aligned, and eventually we get the
human eye.
4 However he never gives us just which genes
changed, how many would've needed to change, or how fast it would have to occur.
It's a just-so story that has no numbers behind it. Modern proponents seem a
little too light on the details to say evolution is of the same type of
knowledge as the earth revolving around the sun.
5 We have
the formula for gravity. We have silence regarding genetic changes.
References