Natural Selection Download mutationSelection.R from Brian O’Meara EEB464 Fall 2015

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Presentation transcript:

Natural Selection Download mutationSelection.R from Brian O’Meara EEB464 Fall h?v=I0YTBj0WHkU

What is required for natural selection Selection versus drift versus mutational bias Frequency dependent selection Balancing selection Selection now

What is required for natural selection? Discuss in groups, then we will select the best definition (pun intended, as always)

Variation

Selection

Reproduction (with heritable traits, and some variation)

1.Organisms within a population vary 2.Some of these variations are heritable 3.More offspring are produced than can survive 4.Individuals with certain heritable traits are more likely to survive and reproduce

5% percentile median 95% percentile ancestor-descendant pairs Fitness

Try giving parameters to model: Mutation selection balance Multiple optima Drift only Etc.

Balancing selection: selection maintaining diversity

Heterozygote advantage aaAaAA ©Muhammad Mahdi Karim Malaria Sickle cell anemia + Aa aa Aa Aa AA

Balancing selection: selection maintaining diversity Frequency-dependent selection Hori 1993; images from ab/classes/evolution/NS_H2.HTM ab/classes/evolution/NS_H2.HTM Note story is more complex than this: Palmer (2010)

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Nettle and Pollet. Natural selection on male wealth in humans. Am Nat (2008) vol. 172 (5) pp