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MENTAL MODEL · M2938

The Grandmother Hypothesis

The Grandmother Hypothesis
CultureHigh supportAnthropology
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Updated 2026-07-31

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INTRODUCTION

English translation pending.

CORE DEFINITION

The grandmother hypothesis, developed by Kristen Hawkes and colleagues, explains the unusual human pattern of long post-reproductive life. Because a woman who stops bearing children can still raise the survival of existing descendants by provisioning and caring for grandchildren, alleles supporting post-menopausal longevity spread. It reframes menopause as an adaptive life-history shift rather than a by-product of ageing. The constraint is that it remains a hypothesis with competing accounts, including the role of fathers and of changing social structure.

SCAFFOLDING EFFECT

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- Non-Breeding Value: look for contribution from members who are no longer in the front line. - Indirect Fitness: measure value by effect on others' output rather than personal output. - Mentoring Leverage: treat coaching as the mechanism by which senior experience compounds.

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Fitness is measured by surviving descendants, not by births. A grandmother who feeds a weaned child frees the mother to conceive again sooner and raises each child's survival odds, so her genes propagate through grandchildren rather than through further children of her own. Long life after fertility is selected for because it increases the total number of surviving carriers.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Grandmother_hypothesisZH · Explicit
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