farmerman wrote:RL--By George, I think youre finally getting it
Quote:Your body builds up resistance to invaders based on genetic information that is ALREADY there.
Ken Miller says approximately the same thing
"Evolution is taking whats already there, and doing something new with it"
The national GEos November Issue has a wonderful article on Hox genes and how they describe the various modes of morphology in the thoracis region. "From wings to fingers"
As Gould and MAyr always said, genes are only the bookeeping of evolution, not the driver. Genetic diversity is responsible for resistance, new genes that occur by repretition or whole chromosomal copying , may or may not occur. For example , Darwins Finches are pretty much the same genetically, they difer by less than 1% from each other. Now, with time, as each new species is exposed to totally different self imposed environments. will their genic makeup change much more? Tune in tomorrow for another episode of "As the Finch Forges Forward"
Of course , as you'd expect, I note that Darwin's finches are all............finches.
They are only 'different species' because we have chosen to call they so.
Different beaks, coloration, habits, etc are basically superficial.
If one were to categorize humans so, you might have many 'different species' of modern humans.
Certainly also , if you were to categorize domesticated dogs in such a manner, you would easily end up with many 'different species' of domesticated dog, as has been previously discussed.
But the arbitrary nature of evolutionary perspective is shown by the fact that domesticated dogs are all generally considered 'one species'.
But my point about immunity is that it is not in any way demonstrative of evolutionary principle.
Instead, it is the organism using genetic information that is ALREADY in existence to cope with it's environment. It doesn't need to 'evolve', and it doesn't do so.