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BB, Bb bb
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1) What are the Phenotype Frequencies?
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Bb bb BB bb Bb 2) What are the Genotype Frequencies?
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Bb bb BB bb Bb 3) What are the Allele Frequencies?
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4) Suppose that the frequency of the b allele in the population is.3. What is the frequency of the B allele in the population? What is the frequency of cats with genotype bb?
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What is the frequency of cats with genotype BB? What is the frequency of cats with genotype bB? What is the frequency of cats with genotype Bb?
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If p = frequency of first allele, and q = frequency of second allele p 2 + 2pq + q 2 = 1 (Hardy-Weinberg Equation) Frequency of BB Frequency of Heterozygotes (Bb or bB) Frequency of bb
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4) Suppose the frequency of B =.2. What are frequencies of the three possible genotypes? frequency (BB) = frequency (bb) = frequency (Bb/bB) =
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Do Allele Frequencies Change Over Time? p =.2 q =.8
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Hardy-Weinberg Principle: In a population, allele frequencies remain constant in the absence of evolutionary forces Bb bb BB bb Bb
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Assumptions of Hardy-Weinberg Principle: Bb bb BB bb Bb 1) Random Mating
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Bb bb BB bb Bb 2) No Mutations Assumptions of Hardy-Weinberg Principle: bb
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Assumptions of Hardy-Weinberg Principle: Bb bb BB bb Bb 3) Large Population Size
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Assumptions of Hardy-Weinberg Principle: Bb bb BB bb Bb 4) No Immigration BB
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Assumptions of Hardy-Weinberg Principle: Bb bb BB bb Bb 5) Genotypes have Equal Fitness ( 2 offspring) (10 offspring) BB (6 offspring)
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Assumptions of Hardy-Weinberg Principle: 1)Random Mating 2)No Mutations 3)Large Population Size 4)No Immigration 5)All Genotypes have Equal Fitness ? How likely is it that a population meets ALL ASSUMPTIONS?
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Case Study: Peppered Moth (Biston betularia) Biston betularia var. typicaBiston betularia var. carbonaria DD, Dddd
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1800 1900 England: Industrial Revolution
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3 4 Explanation?
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10 5 6 7 9 8 Anoles (Anolis): 150 species in the Caribbean Islands Demonstrating the PROCESS of Adaptive Change
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Observed Relationship of Hind Limb Length to Vegetation in Brown Anoles (Anolis sagrei) 11 Hind Limb Length 12 13 14
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15 Brown Anole (Anolis sangrei) Introduction of Brown Anole Populations from Staniel Cay Island to 14 Caribbean Islands (with no preexisting Anole Populations) An Experiment to Test for Adaptive Change
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Fig. 4.12 in Molles 2008 Relationship between.. 1)Vegetation Height Difference between Staniel Cay Island and Other Islands 2)Change in Lizard Morphology
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Relationship between Perch Diameter and Lizard Hind Limb Length Fig. 4.13 in Molles 2008
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Question: Phenotypic Plasticity (= Developmental)? Heritable Trait (with Genetic Basis)?
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Possible Experiment to Test for Phenotypic Plasticity versus Heritability of Leg Length
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17 Soapberry Bug 18 Species Native to U.S. (3) Species Introduced to U.S. (3) 19 Soapberry Bugs and Plants in Soapberry Family (Sapindaceae) Demonstrating HERITABILITY in Natural Selection
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Hypothesis: Beak Length Selected to match Distance to Seed in Fruit 16
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Fig. 4.15 in Molles 2008 Size of Fruit in Native and Introduced Soapberries Florida South Central U.S.
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Fig. 4.16 in Molles 2008 Relationship between Beak Length of Soapberry Bugs and Fruit Size in Native and Introduced Soapberry Species
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Question: Phenotypic Plasticity (= Developmental)? Heritable Trait (with Genetic Basis)?
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Experiment to Test for Adaptive Change
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Experiment to Test for Adaptive Change: Results
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Forms of Natural Selection in Populations: DIRECTIONAL SELECTION 20 21 22 Genotype: BB Genotype: Bb Genotype: bb 24
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Forms of Natural Selection in Populations: DIRECTIONAL SELECTION Fig. 8.15 in Molles 2006
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Forms of Natural Selection in Populations: DISRUPTIVE SELECTION 20 21 22 Genotype: BB Genotype: Bb Genotype: bb 23 24
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Forms of Natural Selection in Populations: DISRUPTIVE SELECTION Fig. 8.15 in Molles 2006
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Forms of Natural Selection in Populations: STABILIZING SELECTION Fig. 8.15 in Molles 2006 20 21 22 Genotype: BB Genotype: Bb Genotype: bb
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Fig. 8.15 in Molles 2006 Forms of Natural Selection in Populations: STABILIZING SELECTION
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Are All Population Changes due to Natural Selection? 26 Chihuahua Spruce
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1 http://media-2.web.britannica.com/eb-media/12/59012-004-3F583FEF.jpg 2 http://www.suffolkmothgroup.org.uk/newsletters/40/PB_PepperedMoth.jpg 3 http://media-3.web.britannica.com/eb-media/11/59011-004-F2BFB969.jpg 4 http://www.mlahanas.de/Cyprus/Fauna/image/EuropeanRobin2.jpg 5 http://images.google.com/images?sourceid=navclient&rlz=1T4GGLR_enUS307 US307&q=anolis&hl=en&um=1&ie=UTF-8&sa=N&tab=wi 6 http://www.naturephoto-cz.eu/pic/sevcik/anolis-baracoae--anolis-baracoae.jpg 7 http://www.hlasek.com/foto/anolis_allisoni_4174.jpg 9 http://www.agamen.de/reptilien/leguane/fotos/Anolis5.jpg 10 http://www.thecaribbeanamphibian.com/images/caribbean-islands-map.jpg 11 http://www.cryptomundo.com/wp-content/uploads/0114anolis_datzorum.jpg
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12 http://www.ahailey.f9.co.uk/pics5/chrysolepis.jpg 13 http://www.mascotissimo.com/wp-content/uploads/2008/02/anoli_verde_ anolis_carolinensis.jpg 14 http://www.uwgb.edu/biodiversity/herbarium/shrubs/alnrug_xsec01.jpg 15 http://upload.wikimedia.org/wikipedia/commons/thumb/9/94/Anolis_sagrei.jpg /250px-Anolis_sagrei.jpg 16 http://www.biology.duke.edu/rausher/soapber1.JPG 17 http://farm3.static.flickr.com/2226/2523728904_258352f8cd.jpg?v=0 18 http://www.biosurvey.ou.edu/shrub/sasad.jpg 19 http://www.ubcbotanicalgarden.org/potd/cardiospermum_halicacabum2.jpg 20 http://www.bluecross.org.uk/web/MultimediaFiles/BLACKRAB5.JPG 21 http://www.fotosearch.com/comp/PDS/PDS711/white-rabbit-black_~AA028208.jpg
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22 http://www.british-giantrabbits.co.uk/images/P7180020.jpg 23 http://i166.photobucket.com/albums/u109/jammyn/070930_Mex9/Mexico380.jpg 24 http://www.natureinstitute.org/pub/ic/ic8/Images/IC8_page10.gif 25 http://pro.corbis.com/images/IH075114.jpg?size=67&uid=%7BB751DF66-D85E- 4E3D-A78C-DC9C3B068766%7D 26 http://www.conifers.org/pi/pic/chihuahuana2.jpg
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