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Biology 3466B Study Guide - Frequency-Dependent Selection, Selfishness

Course Code
BIOL 3466B
Yolanda Morbey

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Kin Selection Ch 6 205-207 Ch 12 447-453 467-477
Categorize types of social interactions
Know when to apply the terms kin selection and
indirect fitness
Calculate relatedness and apply Hamilton’s Rule
Predict conditions favoring altruism among kin and
Explain causes and outcomes of parent-offspring
Explain frequency dependent selection
The Evolution of Altruism
W.D Hamilton (1964): showed the conditions favoring
selection for an allele that causes altruistic behavior
Coefficient of relatedness, r:
Defined as the probability that homologous alleles in
two individuals are identical by descent
Note: this differs from F, the coefficient of
inbreeding, which is the probability that homologous
alleles in the same individual are identical by descent
Homologous alleles identical by descent
Types of Social Interactions
In terms of fitness an interaction between individuals has 4
possible outcomes:
Cooperation (mutualism) - actions that result in fitness
gains for both participants
Altruism individual instigating the action pays a fitness cost
and the individual receiving benefits (sacrifice on behalf of
Selfishness the actor gains and the recipient loses
Spite behavior that results in fitness losses for both
participants (rare in nature, because it would be eliminated by
natural selection)
Calculating r with Pedigrees
1. Draw generalized pedigree of actor and recipient
2. Assign allele transfer probabilities
3. Calculate probability that homologous allele in actor &
recipient is identical due to descent from a common
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