Biology 1001A Lecture Notes - Lecture 18: Diminishing Returns, Kin Selection, Parental Investment
1 May 2013
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Some traits are valued more highly by one sex than the other. Men are more upset if cheated on sexually, whereas women are more upset about being cheated on emotionally. Lower parental investment always competes for higher parental investment. Yes, but there are still persistent sex differences. Self-sacrifice on behalf of another group of organisms. Wolves live in social groups, cooperate in hunting. Actor is harmed, recipient is harmed: spite i. e. elephants, wolves, fish. Altruism is a special difficulty which at first appeared to me insuperable, and actually fatal to my whole theory darwin. Parental care is not really a type of altruism because the individual is increasing his/her number of genes/alleles in their offspring. Self-sacrifice in a way, but they are getting their genes into their next generation. There is a fitness benefit to the parent. Individuals may risk their own life for someone/something that isn"t related to them.
