On the proportion of Nucleotides in the Genome and what it can tell us about Evolutio

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What ratio GC/AT should we expect from a mutating genome ?

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As the good doctor said, we can't formulate any expectations, really. Not without knowing more about mutation and repair than we currently know. Note, for example, that a highly active family of transposons in a particular species will introduce lots of new sequence into the genome, pushing the GC content toward whatever the transposon happens to have.

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sfs, are you the same person as sfs1 on Tweb ?

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The last time I checked, yes, I was.