[diebitter]

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Good point. So, might not clones killing each other off be Darwinian?

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Not really. Destroying anything with which you share a significant proportion of active DNA has enourmous evolutionary pressures against it (how long would a gene last if there was some +ve desire to kill your children, for example?) - I qualify that so that where there are exceptions to this, they ultimately lead to more of your dna getting to the next generation, not less (hence mothers may kill runts, so the rest have better survival changes).

But this circumstances described here is so weird and out of the natural order, thinking in terms of evolution is inappropriate anyway.