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Monkeys, Apes and Humans
Anthropology 1500
Department of Anthropology, University of Missouri-Columbia

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The levels of natural selection

The evolutionary process requires "replicators"—entities that can produce exact copies of themselves, such as genes. Natural selection is the process whereby replicators (genes) outpropagate each other, i.e., differences in the representation or frequency of competing replicators in future generations. Evolution is "blind" and has no predetermined direction. Mutations are random.

Hierarchical organization of life:

Ecosystem

Population

Group

Family

Individual

Gamete

Chromosome

Supergene (linked genes)

Gene

DNA - RNA (some procaryotes)

Unit of selection = entity that replicates exact copies of itself (Dawkins' "replicators") = genes

Levels of selection = where differential reproduction occurs (e.g., an individual has more offspring than competitors) = "vehicles" for gene replication. Replicators (genes) outpropagate each other as a result of differential reproduction at the levels of selection

Selection is most potent where the rate of differential reproduction is highest—usually the individual level.

Selection can act in different directions at different levels; what increases individual fitness may not increase group fitness; what increases chromosome fitness may not increase individual fitness. Which level wins? That is, at which level is selection most likely to produce "adaptations" ?

Conflicts of interest among the levels of selection

 

 

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