8 BISC_120 EvolMech1

8 BISC_120 EvolMech1 - Quiz 1 starts today! Available on...

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1 1 1 Quiz 1 starts today! • Available on Blackboard (under Lecture Quizzes) 12pm (noon) today to 12pm (noon) Monday (72h) • Covers lectures 3-7 • 5 multiple choice questions (5 points total) • No time limit (except the 72h time limit) • Can log out and log back in • Be sure to Submit answers (not just Save them) and wait until Blackboard acknowledges that your answers have been successfully submitted Evolutionary Mechanisms I 23.1-23.2 3 Populations evolve, individuals do not http://www.youtube.com/watch?v=faRlFsYmkeY 4 The Modern Synthesis • Established in the 1930s and 1940s • Integrated Darwinian evolution with Mendelian genetics • Connected the mechanism of evolution (selection on populations) with the units of evolution (genes) +
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2 5 The Hardy-Weinberg principle can be used to test whether a population is evolving • Population = localized group of individuals of the same species that can interbreed and produce fertile offspring • Evolution = change in a population’s allele frequencies over time 6 Hardy Weinberg principle • Given a series of assumptions, allele frequencies and genotype frequencies will not change between generations • The assumptions are: No selection No mutation No migration Infinitely large population Random mating AA Aa aa AA Aa aa aa Generation 1, Gene pool Generation 2, allele freq p and q allele freq p and q AA Aa aa AA Aa aa aa A a a A A a a A a If these assumptions are met, allele and genotype frequencies will not change between generations 8 Some terminology • Imagine a populations made up of 100 diploid individuals: 40AA, 40Aa and 20aa • The genotype frequencies are?………. • The allele frequencies are?……. • The genotype numbers are?…. .
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3 9 Remember the multiplication and addition rules? • If you just roll one die, what’s the chance of getting a 4?
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8 BISC_120 EvolMech1 - Quiz 1 starts today! Available on...

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