Kibble for Thought: Dog diversity prompts new evolution theory

By Christen Brownlee, 15:51 PM April 15, 2008

The wide range of variety in domesticated dogs—from the petite Chihuahua to the monstrous mastiff—has powered a new view of what drives evolution.

Scientists have long known that the evolutionary changes that alter a species' appearance or create new species frequently occur in rapid bursts. One widely accepted theory holds that any evolutionary change results from a random switch of a single genetic unit within DNA.

These single-point mutations occur in about 1 out of every 100 million DNA si...

Source URL: