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Lecture 18

Biology 1001A Lecture Notes - Lecture 18: Liger, Genetic Drift, Asexual Reproduction


Department
Biology
Course Code
BIOL 1001A
Professor
Tom Haffie
Lecture
18

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Lecture 18: Cooperaon and Conict; Speciaon
How can we explain altursic behavior?
- Related individuals have somewhat common evoluonary interests
- Even between close relaves there is the possibility of conict
- Whatever sibling you produce will be twice as valuable to you (0.5) as your siblings children
(0.25)
oYou should only help your siblings only if their bene't is far greater than the risk you
take
- For your parent, both siblings are equally valuable
- Hamilton’s rule can also explain conict in families
- Not example of true altruism because increasing your own 'tness indirectly
Not all self-sacricing behavior is aimed at relaves…
- Help everyone in a group
- Vampire bats somemes help unrelated members of the species
- Maybe losing 'tness themselves
oTrue altruism

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Prisoners Dilemma
- Each person cannot communicate with their partner and can either cooperate or defect and as a
result there is a payo3 matrix
- It would make more sense raonally to defect because you either get 0 or 8 in terms of
minimizing jail me
-
Fable about the lion and the mouse
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- Repeated interacons between individuals will tend to increase self-sacri'cing and helpfulness
even when you are not related
-
Human Emoons and Language: mechanisms for social scorekeeping?
Emoons evolved when you see someone (such as trust or resentment) may have evolved as a result of
favouring cooperaon
- In the natural world many altruisc behavior may be the result of kin selecon and other
apparent self-sacri'cing behavior may actually increase the 'tness of the actor at another me
reciprocal altruism
- Fitness payo3s as a result of helping others in the future
- So there may not be any true altruism (at least not in our species)
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