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Scientists Found a Hidden Force That Pushes Life Past the Limits of Evolution
Yahoo • • science
Key Points:
- Researchers have found that organisms at peak evolutionary fitness continue to evolve through a process called directional drift, even without new selection pressures driving change.
- Degeneracy, where different sets of traits yield the same fitness peak, allows species to reach optimal survival states via multiple evolutionary paths and remain stable for millions of years.
- Directional drift is a consistent evolutionary push influenced by the curvature of the fitness landscape, guiding populations toward flatter, more robust trait combinations that resist disruption.
- This ongoing evolution occurs without traditional fitness advantages, meaning species can become stronger and more resilient as a side effect of their position on the fitness landscape.
- The study challenges the long-held assumption that evolution becomes random after reaching peak fitness and highlights the importance of landscape shape and population variability in shaping evolutionary trajectories.
