MECHANISTIC THEORIES. “Or ensemble of alleles that appears by mutation and then spreads from low frequencies by group selection. Instead, the key polyphenic allele (or allele ensemble) may in theory be previously fixed in the population by individual direct selection (as opposed to group selection), with solitary behavior the norm in most environments and eusocial behavior in other, rare and extreme environments. With a shift in the available environment in space or time, eusocial behavior would become the norm.”
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