UT Knoxville BIOL 130 - Notes, Lecture 20 (2 pages)

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Notes, Lecture 20



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Notes, Lecture 20

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Pages:
2
School:
University of Tennessee
Course:
Biol 130 - Biodiversity

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30 JANUARY 2014 23 BIO130 013014 1 30 2014 Bio 130 TR 12 40 1 55p Lecture 7 Turn in description of sexual selection Cassie is giving a guest lecture on Tuesday bring your clicker Big Quiz average 40 50 80 Exam will be harder but you can replace big quiz grade with that average Evolutionary Processes processes that can change allele frequencies over time 1 2 3 4 Natural Selection Genetic Drif Gene Flow Mutation Objectives Explain how sexual selection differs from normal natural selection Explain how any evolutionary process results in evolution What is it Effect on fitness genetic variation Explain how levels of gene flow affects a population s evolution Species Population Individual Population A group of individuals from the same species that live in the same area and interact 1 Natural Selection Increases fitness and results in adaptation can increase or decrease genetic variation a Sexual selection selection due to success in courtship obtaining mates Female choice Male male competition Video Homework Review Phenotypes Song color plumage ornamental feathers behavior dance Mutations cause natural selection and females prefer brighter males Females are the more choosy gender because males are less involved in parental care but carrying offspring for a female is a resource taxing experience There is male to male competition that also influences sexual selection There is a limit to how showy males can be because they still have to be able to survive get food and hide from predators 2 Genetic Drif Allele frequencies change fluctuate due to chance random process e g random mortality due to flooding human interaction There is no way to predict the affect that drif will have the population Chance events add up very quickly in small populations while have less affect in a large population The effect of genetic drif is that it reduces genetic variation The founder effect is when a new population randomly has different allele frequencies than the original population because



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