Flashcards in Kin Selection Deck (19):
an action that reduces an individuals own fitness while increasing the fitness of another individual
Direct Fitness (# offspring) plus equivalents gained through support
best strategy given others responses
a strategy that is the best response, given other participant’s responses --> no-one benefits further unless multiple participants agree to change their strategies
Evolutionarily Stable Strategy
a strategy that cannot be invaded by a rare mutant using an alternative strategy
a special case of Nash equilibrium
Turn in for 0 charge, confess for chance at min charge, or get turned in and face full charge
Nash equilibrium: best strategy given others strategy so if your partner talks you should talk and if they don't you shouldn't either
some members forego reproduction while in the group, help elsewhere
May risk death by defending the colony.
Devote energies toward rearing of young of others (helping at the nest).
individuals cooperate in the care of young
There is reproductive division of labor, with sterile (or nearly sterile) workers assisting fecund individuals.
Kin Selection (Hamilton 1963)
Selection acting on individuals related through recent, common descent
Fitness = direct fitness + r x fitness effect on relatives
Fitness = direct fitness + indirect fitness
Hamilton's Rule (CONT)
c = cost to altruist
b = benefit to altruist relatives
w = fitness if selfish
prairie dog watcher
acting selfishly because he has least chance of being eaten
Females develop from fertilized eggs (Diploid)
Males develop from unfertilized eggs (Haploid)
Altruism is rewarded with altruism
Defectors are ‘punished’ because they do not receive cooperation in the future (ex. vampire bats)
Cost of helping
fitness when not helping - fitness when helping
fitness when helped - fitness when not helped
what is the formula for fitness if being altruistic?
w - c + r x b
when should you act altruistically?
c fitness if selfish
what is r?
relatedness, r, the probability that two individuals share a particular allele
group members are more similar to one another than to members of other groups