quote:
The problem comes in when we start to assume that given enough time (millions of years) and enough of these mutations (many of which are neither beneficial nor deletitious) a population could be changed enough to have some kind of reproductive barrier to the parent population. In fact, we have never observe of such an instance when a population is isolated long enough from the parent population that a new species is resulted from the isolated population.
This is false.
We have, in fact, directly observed speciation in real time, both in the lab and in the field.
In plants, for example, we have observed speciation to happen in a matter of decades, and in even less time.
This message has been edited by schrafinator, 04-19-2006 08:13 AM