Evolution of Lifelong Heterogeneity
It is unlikely that lifelong heterogeneity in robustness will be extreme, if it occurs at all. Natural selection will favor genotypes with much greater robustness, reducing the genetic variance for robustness over time. Natural selection will also favor genotypes that reduce the amount of developmental or environmental variation in robustness. Stable genetic equilibria with sufficient levels of lifelong heterogeneity to cause mortality plateaus seem unlikely.
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