F2F-Hybrid Virtual Lab 1 Population Genetics Handout 21-22

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Virginia Commonwealth University *

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101

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Biology

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Oct 30, 2023

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Bio 102 Lab 1 Handout: Descent with Modification Name: _________________ Section: __________ You must download this file to view properly. This handout factors into your post-lab grade. You must submit it at the end of class or as a picture into the post-lab. As you complete the lab, please fill out the corresponding section on the handout. Section I: The Requirements for Evolution by Natural Selection. A: No Variation. Fill in the blank: Prediction: If all the beans are large, then the population ___________ (will or will not) evolve because the genotype frequency) __________ (changes or does not change) from one generation to the next. No Variation in a Population. Table 1: No Variation in Population Simulation Data Generation 1 Trait/Genotype Starting Population Genotype Frequency Died Survivors Large - AA 48 48/48=1.0 Total 48 Generation 2 Trait/Genotype Starting Population Genotype Frequency Died Survivors AA Total Generation 3 Trait/Genotype Starting Population Genotype Frequency Stop here AA Total Pie Graphs: Graph the Genotype frequency from Table 1. When a population evolves, the frequencies for a same genotype change over generations. If the frequencies remain the same, the population did not evolve. Did this population evolve? ________ (yes or no). Is variation a requirement for evolution? _________ (yes or no) 1 Starting Population Generation 1 Starting Population Generation 2 Starting Population Generation 3
B1: Traits are Heritable. Fill in the blank. Prediction: If smaller beans have a selective advantage and this trait is heritable, then this trait __________ (will or will not) accumulate in the population. Table 2: Traits Heritable Simulation Data Generation 1 Genotype (phenotype) Starting Population Genotype Frequency Died Survivors AA (Large) 16 16/48 = 0.33 Aa (Medium) 16 16/48 = 0.33 aa (small) 16 16/48 = 0.34 Total 48 Generation 2 Genotype (phenotype) Starting Population Genotype Frequency Died Survivors AA (Large) Aa (Medium) aa (small) Total Generation 3 Genotype (phenotype) Starting Population Genotype Frequency Stop here AA (Large) Aa (Medium) aa (Small) Total Pie Graphs: Graph the Genotype frequency from Table 2. When a population evolves, the frequencies for a same genotype change over generations. If the frequencies remain the same, the population did not evolve. Did this population evolve? ________ (yes or no). If the population evolved, evolution was _____________ (adaptive or random). B2: Traits are Not Heritable 2 Starting Population Generation 1 Starting Population Generation 2 Starting Population Generation 3
Fill in the blank. Prediction: If small prey has a selective advantage and this trait is NOT heritable, then this trait __________ (will or will not) accumulate in the same way as when traits were heritable. Table 3: Traits Not Heritable Simulation Data Generation 1 Genotype (phenotype) Starting Population Genotype Frequency Died Survivors Birth tally AA (Large) 16 Aa (Medium) 16 aa (small) 16 Total 48 Generation 2 Genotype (phenotype) Starting Population Genotype Frequency Died Survivors Birth tally AA (Large) Aa (Medium) aa (small) Total Generation 3 Genotype (phenotype) Starting Population Genotype Frequency Stop here AA (Large) Aa (Medium) aa (Small) Total Pie Graphs: Graph the Genotype frequency from Table 3. Fill in the blank: Did this population evolve? ________ (yes or no). If the population evolved, did it evolve in the same way as on Page 2 of this handout? _______ (yes or no). If the population did not evolve in the same way, do traits have to be heritable for adaptive evolution to occur? ______ (yes or no) 3 Starting Population Generation 1 Starting Population Generation 2 Starting Population Generation 3
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