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Perhaps larger genomes are more complex, integrated -- and therefore less tolerant of mutation (I’m ignoring giants formed via polyploidy etc.). Perhaps in larger genomes there are mechanisms for reducing or repairing mutations. CHIMERAS put up a very interesting post last week about “gene migration” from captured organelles to the host genome. Once there, the rate of mutation drops and so these genes are a bit like “molecular fossils” compared with organelle DNA, which has continued to mutate at the higher organelle rate. See post for more details and paper cited.


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