kin selection Flashcards
the idea that aggregation of individuals into groups with a particular social structure promotes the overall fitness of group memebers
group selection
behavior that decreases the fitness of the actor and increases the fitness of the recipient
altruism
initiator of interaction
actor
recipient of an nteraction
recipient
4 possible types if interaction isn terms of fitness consequences
cooperative
selfish
altruistic
spiteful
recipient benefits and actor benefits
cooperative
recipient benefits and actor is harmed
altruistic
recipient is harmed and actor benefits
selfish
recipient is harmed and actor is harmed
spiteful
the probability that homologous allele in 2 individuals are identical by descent
coefficient of relatedness (r)
r for parents to offspring and full siblings
1/2
r for half siblings
grandparent to grandchild
aunt/uncle to niece/nephew
1/4
r for first cousins
1/8
Hamiltons rule (definition)
alleles for altruistic behavior will spread under certain conditions
hamiltons rule (variables)
Br-C>0
B in Hamiltons rule
benefit to recipient
r in Hamilton rule
coefficient of relatedness
C in Hamiltons rule
cost to the actor
altruistic behavior is most like to spread when (3)
B is high
C is low
R is high
fitness resulting for direct personal reproduction
direct fitness
fitness resulting from additional reproduction by close relatives can be increased by an individuals actions and assistance
indirect fitness
natural selection favoring spread of alleles that increase indirect fitness via ones close relatives
kin selection
in ground squirrels, different call types have different outcomes
whistles for arial predators are _
while trills for ground predators are _
selfish
altruistic
prairie dogs give more alarm calls in the presence of
kin