Scientists Identify Irreversible 'Evolutionary Highways' in Animal Genomes

A large-scale study of thousands of animal genomes shows that chromosomal changes follow a small set of irreversible pathways, rather than random drift. These one‑way genetic shifts preserve a record of over 600 million years of animal evolution. By mapping these evolutionary highways, researchers can trace deep ancestral relationships and potentially forecast future evolutionary directions. The findings suggest that chromosome evolution is guided by predictable routes, offering a new framework for studying long‑term genetic change.