The Time Invariance and Nondecreasing Expectation of an Evolutionary Path Characteristic under Weak Selection.

Abstract excerpt

AbstractFisher's fundamental theorem states that the rate of change in mean fitness due to natural selection equals the additive genetic variance in fitness, suggesting that selection generally drives populations toward higher average fitness. Yet in real populations, this increase can be altered or reversed by mutation, frequency-dependent selection, or environmental fluctuations, underscoring the need for...

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