Conclusion
The grandmother effect needs to establish that longevity, menopause expression, and redirected investment commonly occurred in our ancestral past. Evidence from contemporary hunter-gather societies and historical data produce mixed results. Many theoretical assumptions, such as differing strategies for maternal and parental grandparents, have been shown. The fundamental flaw, however, is the exclusion of male assistance and benefits from continued fertility.
Read more about this topic: Grandmother Hypothesis
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