The "ring of life" is a model that describes the evolutionary relationships among the three domains of life: Bacteria, Archaea, and Eukarya. It emphasizes horizontal gene transfer as a significant evolutionary mechanism, particularly in early life forms.
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The ring of life model suggests that the last universal common ancestor (LUCA) had characteristics of both Bacteria and Archaea.
Horizontal gene transfer plays a crucial role in the ring of life concept, contrasting with the traditional tree of life model.
Eukaryotes are believed to have emerged through symbiotic relationships involving both bacterial and archaeal ancestors.
The ring of life challenges the linear progression implied by phylogenetic trees, proposing a more network-like evolution.
Genomic analyses support the idea that many eukaryotic genes have prokaryotic origins from both Bacteria and Archaea.
Review Questions
What does the ring of life model emphasize about evolutionary mechanisms?
How does horizontal gene transfer influence the concept of the ring of life?
What evidence supports the idea that eukaryotes have mixed origins from Bacteria and Archaea?
Related terms
Phylogenetic Tree: A branching diagram showing inferred evolutionary relationships among various biological species based on similarities and differences in their physical or genetic characteristics.
Horizontal Gene Transfer: The movement of genetic material between unicellular and/or multicellular organisms other than by vertical transmission (from parent to offspring).
Last Universal Common Ancestor (LUCA): The most recent organism from which all organisms now living on Earth have a common descent.