lecture 17 population genetics may 15

lecture 17 population genetics may 15 - This week Monday...

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This week Monday start Population Genetics (not on exam II) Discussion Sections will do review for midterm Wednesday is in-class review Thursday: my office hours are 9 to 11 in Botany 328 May 18, Midterm II 5-7 pm LaKretz 110: I-Z PAB 1425: A-H If you have a conflict, come see me after class today. Friday: no class
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Week 7 assigned problems, reading Interactive genetics probs 1-5 Text: reading changes from 621-624 to 612-615 and 621-626. Work Solved prob 2, and probs 2-4,7,10-13,15-17.
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Population Genetics All crosses so far have involved specific matings, i.e. we know who the parents are. In their natural habitat, most animals do not form specific family groupings and relationships between individuals are unknown. Application of genetic principles to entire populations of organisms is the subject of population genetics.
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What is a population? Group of organisms of the same species living close to and mating with one another
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Population genetics is closely tied to the study of evolution
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Evolution: a process of continuous change to a higher, more complex or better state (Merriam-Webster) •Evolution: changes in allele frequency in a population •Allele frequency: # copies of an allele total number of all alleles •If all allele frequencies remain unchanged over many generations, there is no evolution
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What causes allele frequencies to change? Mutation: direct alteration of an allele
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Migration: new individuals with different alleles move into new population (or others leave)
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Genetic drift: random change in allele frequency allele frequency may change due to small number of progeny just by chance In large populations, these changes tend to cancel each other out
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Natural selection variation heritability differential reproductive success
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