for: Major Evolutionary Transitions in individuality, MET, MET in Individuality
- Abstract
- The evolution of life on earth has been driven by a small number of major evolutionary transitions.
- These transitions have been characterized by individuals that could previously replicate independently, cooperating to form a new, more complex life form.
- For example,
- archaea and eubacteria formed eukaryotic cells, and
- cells formed multicellular organisms.
- However, not all cooperative groups are en route to major transitions.
- How can we explain why major evolutionary transitions have or haven’t taken place on different branches of the tree of life?
- We break down major transitions into two steps:
- the formation of a cooperative group and
- the transformation of that group into an integrated entity.
- We show how these steps require
- cooperation,
- division of labor,
- communication,
- mutual dependence, and
- negligible within-group conflict.
- We break down major transitions into two steps:
- We find that certain ecological conditions and the ways in which groups form have played recurrent roles in driving multiple transitions.
- In contrast, we find that other factors have played relatively minor roles at many key points, such as
- within-group kin discrimination and
- mechanisms to actively repress competition.
- More generally, by identifying the small number of factors that have driven major transitions, we provide a simpler and more unified description of how life on earth has evolved.