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Social Evolution and Inclusive Fitness TheoryAn Introduction$
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James A.R. Marshall

Print publication date: 2015

Print ISBN-13: 9780691161563

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691161563.001.0001

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Variants of Hamilton’s Rule and Evolutionary Explanations

Variants of Hamilton’s Rule and Evolutionary Explanations

(p.78) Chapter Seven Variants of Hamilton’s Rule and Evolutionary Explanations
Social Evolution and Inclusive Fitness Theory

James A.R. Marshall

Princeton University Press

This chapter examines four variants of Hamilton's rule and how they give different evolutionary explanations for certain social behaviors such as greenbeard traits. These variants are: HR1, which extends Hamilton's rule with a synergistic coefficient capturing the deviation from additivity of fitness interactions; HR2, which deals with the conditional expression of phenotype; HR3, which is concerned with fitness as partial regression; and HR4, the geometric view of relatedness. These variants differ in how they treat the three key parameters of the original: “relatedness,” “cost,” and “benefit.” The chapter also considers how the nongenetic explanation of the evolution of altruism can actually be recast in a version with genetic relatedness, and how geometric relatedness underlies phenotypic assortment. Finally, it discusses different viewpoints on conditional behaviors.

Keywords:   evolution, social behaviors, greenbeard traits, Hamilton's rule, synergistic coefficient, fitness, phenotype, relatedness, conditional behaviors, phenotypic assortment

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