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army1987 comments on On manipulating others - Less Wrong
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When doing so advantages your siblings/parents/children more than twice as much as it disadvantages you (or your grandparents/grandchildrens/aunts/nephews/etc. more than four times as much, etc.)?
Assuming all of your relatives have the same altruistic mutation and the non-mutated people do not derive any significant fitness benefit from your altruism.
If this was assumed then the "twice as much", "more than four times as much, etc" wouldn't be required. Since until recently evolution's playthings didn't have the ability to directly determine the genetic makeup of relatives the probabilistic accounting that Army refers to is closer to what (this kind of) altruistic behaviour can have been based on. (ie. It is the expectation of genetic similarity not the actual genetic similarity that motivates the action.)
Yes.