Conserved Noncoding Elements: More Contradictory Genetic Data

Thousands of DNA segments have been found to be nearly identical across a wide range of species including human, mouse, rat, dog, chicken and fish. Evolutionary theory expected no such high similarity for species that are supposed to have been evolving independently for hundreds of millions of years. The only explanation could be a super strong functional constraint requiring the very unusual similarities, but none was found. Now new research is adding a twist to the story.   Read more