Genome increase as a clock for the origin and evolution of life
2006
Genome Increase as a Clock for the Origin and Evolution of Life
publication
Evidence: moderate
Author Information
Author(s): Alexei A Sharov
Primary Institution: National Institute on Aging (NIA/NIH)
Hypothesis
Biological complexity increased exponentially during evolution.
Conclusion
The increase of functional non-redundant genome size in macro-evolution was consistent with the exponential hypothesis.
Supporting Evidence
- Regression analysis showed a 7.8-fold increase in complexity per billion years.
- The study discusses the possibility of panspermia as a source of life on Earth.
- Functional genome size in mammals is estimated to be around 4.8 × 10^8 bp.
Takeaway
The study suggests that the complexity of living things has been growing faster over time, like a clock ticking for evolution.
Methodology
Regression analysis of the logarithm of functional non-redundant genome size versus time of origin in major groups of organisms.
Limitations
The regression cannot be viewed as proof of the exponential hypothesis due to reliance on extrapolation rather than direct measurement.
Digital Object Identifier (DOI)
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