define inclusive fitness and reciprocal altruism.Discuss conditions that would favor the revolution of altr...?

Mauro Cowee: Mammals are known to exhibit reciprocal altruism. Species with complex social interactions, in stable groups where the members easily recognize each other as fellow members, and know members tend to interact with mutual altruism are the ones that evolve this behavior.Multilevel selection pressures are evident with selfishness beating altruism within groups but altruistic groups beating selfish groups. Beating in this sense is by having greater total reproductive success and having more surviving offspring in subsequent generations.The Haystack model; there are several large discrete populations that do not have migration between them. They each have true breeding altruists and selfish members in the population. While the selfish members tend to do better within a group and increase in numbers this group, as a whole, will do worse than groups with fewer selfish members that work collectively (as long as the benefit to recipient >>> cost to altruist)http://en.w! ikipedia.org/wiki/Group_selectionBeing able to gather in food from abundant supplies allows the species to benefit from shared efforts later when food is scarce. Social insects are exemplars of this behavior when it is kin based.Humans are examples of when this altruistic behavior is practiced without kinship. An altruist helps another, unrelated altruist, survive to pass on the trait. This is the inclusive fitness factor that depends on ....This type of mutual behavior helps the recipient more than it costs the benefactor to act. Mutual altruism does not require a major sacrifice from the benefactor. If the behavior is repeated often enough within a group there is a chance the roles may be reversed and will happen even when close relatives are not the only possible beneficiaries. In this way individuals that act to assist other members of the group may be the recipients in the future and they do not have to be related but they all share the altruistic trait....Show more