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Kin Selection

Intro to Evolution

QuestionAnswer
Altruism Behavior that incurs a fitness cost (c) to the actor and provides a fitness benefit (B) to the recipient.
Kin Selection Evolutionary process where an altruistic allele increases in frequency because beneficiaries are related to the actor.
Inclusive Fitness The sum of an individual's direct fitness and indirect fitness effects on relatives, each weighted by relatedness (r).
Hamilton's Rule Mathematical condition for kin selection: Br > c (Benefit x Relatedness > Cost)
B (Hamilton's Rule) The fitness benefit gained by the recipient of an altruistic act.
r (Hamilton's Rule) The coefficient of relatedness between the actor and the recipient.
c (Hamilton's Rule) The fitness cost incurred by the actor performing the altruistic behavior.
Solitary Sociality Living alone without social structure or group parental care.
Subsocial Social structure consisting of a single generation.
Quasi-social Single generation structure exhibiting parental care.
Semi-social Single generation structure with parental care and division of labor.
Eusociality Extreme sociality defined by cooperative brood care, overlapping adult generations, and reproductive division of labor.
Haplodiploidy Sex-determination system where females are diploid (fertilized egg) and males are haploid (unfertilized egg).
Haplodiploid Sister-Sister Relatedness Full sisters share 75% (r = 0.75) of their genes due to shared haploid fathers.
Haplodiploid Sister-Brother Relatedness Sisters share 25% (r = 0.25) of their genes with brothers.
Greenbeard Effect Genetic mechanism where a linked marker and altruistic behavior toward marker-bearers drive social evolution without close relatedness.
Gp-9 Gene in Fire Ants Real-world greenbeard example where workers kill homozygous dominant (BB) queens, leaving only heterozygous (Bb) queens.
Created by: bbrdd
 

 



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