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Psych- Evolution 2.docx

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McMaster University
Joe Kim

Evolution 2 Introduction to Social Behaviours  Organisms evolved to maximize their fitness and reproductive success. Many examples in humans and social animals where individuals appear to behave altruistically; helping others to a cost to themselves.  Examples: bees spend their lives in the service of the colony helping to raise eggs laid by the Queen and many bees often die defending their colony from predators. Also, in Belding’s ground squirrels, individuals will frequently give alarm calls to warn others that there is a predator in the area, giving everyone a chance to flee and hide. However, the “whistle blower” draws attention to itself, alerting the predator to its exact location. Finally, humans cooperate by helping their family, friends and strangers.  Evolution acts at the level of genes and those genes that contribute to an individual’s fitness will consequently get replicated more often, increasing in frequency in successive generations.  “Selfish gene”  Natural Selection will favour the genes that best serve their own interest. Types of Social Behaviours  Cooperation- working together to help both the other person as well as themselves.  Cost < Benefit  For the good of the gene only  Good of the Group?= if you happen to be lucky enough to discover some food others might come over and eat some too. But more often, a bird ill end up being the lucky one; even though you’ll have some food taken from you on occasion, you’ll also have opportunities to take food from others when they find it first.  The foraging-vigilance trade-off= while one of the birds is searching for food, they are more vulnerable to predators by having their head down; so the other bird will be vigilant.  Altruism- Behaviour in which the actor incurs a cost to provide a benefit to a recipient.
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