handout12 - Lecture 12 Selection Selection acts on...

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1 Lecture 12 Selection Selection acts on phenotypes survival and reproductive success Fitness the ability to survive and reproduce Relative Fitness comparison of fitness levels among alternative phenotypes and genotypes Example: Number per 1000 observed AA Aa aa #/1000 800 800 200 Notice: -- loss of animals from all genotypes -- AA = Aa and less aa / 1000 born
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2 Example: Number per 1000 observed AA Aa aa #/1000 800 800 200 % .8 .2 800/1000 200/1000 Example: Number per 1000 observed AA Aa aa #/1000 800 800 200 % 1 1 .2/.8 = .25 relative fitness --Taken as a ratio to the most fit-- Example: Number per 1000 observed AA Aa aa #/1000 800 800 200 % 1 1 .2/.8 = .25 relative fitness For aa: 1-s = .25 s = .75 (lose above expected)
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3 Example: Number per 1000 observed AA Aa aa #/1000 800 800 200 % .8 .2 1 1 (1-s) relative fitness Born 1000 Expected 800 Observed 200 600 Additional Loss s = 600/800 = .75 Genotypes Mode of Inheritance AA Aa aa 1) Complete Dominance a. Favoring A_ 1 1 1-s b. Favoring aa 1 (0 < s < 1) 2) Incomplete Dominance Favoring AA 1 1 2 (0 < s 2 < 1) (0< s 1 < .5s 2 ) 3) Overdominance Favoring Aa 1 1 2 (0 < s 1 < 1) (0 < s 2 < 1)
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4 Genotype AA Aa aa
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handout12 - Lecture 12 Selection Selection acts on...

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