6_EvolMech1

6_EvolMech1 - Quiz 2 Available on Blackboard Wednesday Sept...

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1 Quiz 2 Available on Blackboard Wednesday Sept 10 (11AM) to Thursday Sept 11 (11AM) Covers lectures 4, 5 and 6
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Evolutionary Mechanisms I 23.1-23.2
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3 Populations evolve, individuals do not http://www.youtube.com/watch?v=faRlFsYmkeY X
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4 The Modern Synthesis Established in the 1930s and 1940s Connected the units of evolution (genes) with the mechanism of evolution (selection on populations) Integrated Darwinian evolution with Mendelian genetics +
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5 The Hardy-Weinberg principle can be used to test whether a population is evolving A population is a localized group of individuals of the same species that can interbreed and produce fertile offspring Members of a population are on average more closely related to each other than to members of other populations
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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
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7 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
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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?……. The allele numbers are?…. .
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9 Remember the multiplication and addition rules? If you just roll one die, what’s the chance of getting a 4? What’s the chance of getting 4 twice in a row? The combined probability of independent events occurring together is the product of their individual probabilities
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10 If you just roll one die, what’s the probability of getting either a 4 or a 6? The combined probability of 2 mutually exclusive events is the sum of their individual probabilities
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11 A A a a 0.4 0.6 Eggs Sperm Under Hardy-Weinberg equilibrium, allele frequencies predict genotype frequencies Here’s a numerical example using Punnett squares: 0.4 0.6 0.16 AA 0.48 Aa 0.36 aa Freq A = p = 0.4 Freq a = q = 0.6 .16 AA .24 aA .24 Aa .36 aa
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12 A A a a p q Eggs Sperm Here’s the same thing using symbols. ..
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This note was uploaded on 07/26/2009 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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6_EvolMech1 - Quiz 2 Available on Blackboard Wednesday Sept...

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