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Dollo’s Law turns out to be no more profound than the ‘law’ that if you toss a coin 50 times, you won’t get all heads—nor all tails, nor strict alternation, nor any other particular, prespecified sequence. The same ‘thermodynamic’ law would also state that any particular evolutionary pathway in a ‘forward’ direction (whatever that might mean!) will not be precisely followed twice.
The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution
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