Lecture 3 - 11.01.11

Lecture 3 - 11.01.11 - 11th January 2011 Psych 178 Lecture...

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11 th January 2011 Psych 178 – Lecture 3 The Person as a Machine Altruism – why does it exist? It is not the survival of the self but the survival of the gene pool. You would sacrifice yourself to save your offspring if there is more genetic gain than cost in doing so. Characteristics that reduce survival chances – 2 nd challenge of classical theory Peacock feathers are not in service of individual survival. Nature Video – Triumph of Life One sex often pays a higher price than others in reproduction. o Females have to bring up the offspring but the males are only involved in the sex act itself. Females instinctively make sacrifices to breed. This is built into their genes. Some males sacrifice their life so that they can father more offspring with the female. He will die eventually, so he might as well sacrifice it to increase his chances of passing on his genes. Sockeye salmon migrate back to where they were hatched, despite the dangers on the way. Although they are exhausted, they have to fight for mates. Cloning is a way of reproducing without having sex. This means that both the offspring are genetically identical. It is quick and there is no risk in looking for a mate. Some geckos can do this too: the female can lay eggs without needing to mate and they will all be
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Lecture 3 - 11.01.11 - 11th January 2011 Psych 178 Lecture...

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