lab2.Evolution&Natural selection_complete

lab2.Evolution&Natural selection_complete - 2/2/12 1 +...

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Unformatted text preview: 2/2/12 1 + Lab #2 Evolution, Natural Selection BIOL 1209 + Today’s Lab n Office hours: n Tuesday & Friday 10:30-11:30 n Quiz #1 n Review PopG from last week n PopG simulations n In class writing assignment n Replica plating n Hypothesis ATTENTION ALL BIOLOGY 1202 STUDENTS Want to improve your BIOLOGY SKILLS and YOUR GRADES? Join us for BIOMES 2 ¡ an active learning biology study group! BIOMES 2 BIOMES 2 WHEN and WHERE? Mondays, 3:30-5:00 pm, 28 LSB Tuesdays, 7:00-8:30 pm, A101 LSB Wednesdays, 6:30-8:00 pm, A101 LSB Thursdays, 5:30-7:00 pm, A101 LSB HAVE QUESTIONS? CONTACT Sheri Glowinski , BIOMES 2 Coordinator at: [email protected] AND, VISIT US HERE: http://www.biology.lsu.edu/cos/biosci/ IntroBioProgram/item37751.html 2/2/12 2 + Evolution: Change in the genetic make-up of a population over time n When there are no changes in a population’s genotype frequencies a population is in Genetic Equilibrium (evolution does not occur) n Conditions of Equilibrium n Large population size n No selection n Random mating n No mutation n No migration + Trial # P(A) 1 0.5 2 0.55 3 0.45 4 0.4 5 0.55 Mean 0.49 St.dev 0.06 Case 1. Genetic Equilibrium Did the population exhibit genetic equilibrium? Yes WHY? Because the observed final allele frequency was not significantly different from the expected (0.5) 2/2/12 2 + Evolution: Change in the genetic make-up of a population over time n When there are no changes in a population’s genotype frequencies a population is in Genetic Equilibrium (evolution does not occur) n Conditions of Equilibrium n Large population size n No selection n Random mating n No mutation n No migration + Trial # P(A) 1 0.5 2 0.55 3 0.45 4 0.4 5 0.55 Mean 0.49 St.dev 0.06 Case 1. Genetic Equilibrium Did the population exhibit genetic equilibrium? Yes WHY? Because the observed final allele frequency was not significantly different from the expected (0.5) 2/2/12 3 + Mechanisms for Evolution: Change in allele frequencies through time o allele frequencies change? 1) Natural Selection Heterozygote advantage 2) Genetic Drift 3) Mutation 4) Migration Important to consider the environment – to which populations are responding to. Very variable, so traits that might be advantageous in one type of environment might not be so in a different setting + Natural Selection n Process in which individuals with advantageous or “adaptive” traits tend to be more successful than their peers reproductively— meaning they contribute more offspring to the succeeding generation than others....
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This note was uploaded on 03/20/2012 for the course BIOL BIOL 1209 taught by Professor Gregg during the Spring '09 term at LSU.

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lab2.Evolution&Natural selection_complete - 2/2/12 1 +...

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