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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: LLCF who wrote (1442)	6/20/2006 1:04:39 PM
From: TigerPaw	Read Replies (1) \| Respond to of 69300

The point is, can random mutation select quickly enough Mutations don't select at all. Selections are things that happen in the events and environments of the lifeform. If a change is so drastic that none of the characteristics already present in the species are good enough, then the species goes extinct. Species change because some minority of the population already contains the variation needed to survive in a changing circumstance. The minority becomes the majority. That is the essence of the change. If the change is persistant or ongoing, then the minority-to-majority shift can happen in later generations too and the changes from the original population are even more dramatic. The population will experience and retain some mutations, but this is at a much slower and steady rate. Once the selection pressure has eased and there are new niches to fill there is a greater chance for varieties with mutations to survive and spread the mutation, and a greater number of individuals which could harbor a new mutation. TP