PPT-selection versus drift

The larger the population the longer it takes for an allele to become fixed Note Even though an allele conveys a strong selective advantage of 10 the allele has a rather large chance to go extinct . adaptationist. . explanations. …. 5) A feature may be a by-product of selection for another trait. Spandrel = a phenotypic characteristic that is a byproduct of the evolution of some other character, rather than a direct product of adaptive selection. . Today’s objective:. Define each evolutionary mechanism and identify which is taking place in a given scenario.. CQ: Evolution results in a better match of an organism and the environment?. Yes. No . Genetic Drift (and Inbreeding). DEVIATION. . from . Hardy-Weinberg Equilibrium. Indicates that . EVOLUTION. Is happening. 4 Major Evolutionary Mechanisms that alter allele frequencies in populations:. Speciation—Drift. Drift is important in evolution. Just because an allele is common doesn’t mean selection favored it. Speciation via drift?. Probably not.. Flies in . allopatry. , same environment never . Changing Allele Frequencies. Evolution. Evolution is defined as a change in the inherited characteristics of biological . populations. over successive generations. . Microevolution involves the change in allele frequencies that occur over time . Ned Dochtermann. Erin Gillam. Tim Greives. Steve Travers. (North Dakota State Univ.). Kris Holder. Jen Weghorst . (Univ. of Kansas). Facilitators:. Catherine Kirkpatrick . (Univ. of Minnesota). Steven Ralph . . Chapter. 12-1. Pan-. gaea. . “. all. - earth. ” . Note: Our world today is actually a 2’nd or 3’rd generation “super continent” or “. pangea. ” !!!. . Alfred Wegener . weinberg. practice . Changes in allele frequencies. Turn in: Comparing AA WS and video notes. Homework. Chp. 20 reading and notes (Due Tuesday). Natural selection video and notes. Hardy-. weinberg. Erin Gillam. Tim Greives. Steve Travers. (North Dakota State Univ.). Kris Holder. Jen Weghorst . (Univ. of Kansas). Facilitators:. Catherine Kirkpatrick . (Univ. of Minnesota). Steven Ralph . (Univ. of North Dakota). Mannix 2018-2019 . Introduction . Population genetics is the study of change in the frequencies of alleles within a population. . 1 allele comes from mom and the other from dad. . 2 alleles together is called the genotype . 1. OVERVIEW. 2. Natural selection . acts . on . individuals. , but . only . populations. . evolve. .. Genetic variations in populations contribute to evolution.. Microevolution . is d. efined as a change in . Patterns of inheritance. Starter. Natural selection recap. Can you remember natural selection from GCSE and AS?. Outline the process of natural selection. Natural selection. Within any species there is variation, due to different alleles. …. . 4 exams. 1. st. : Chapters 20, 21, 25, 26, . 5. 8. 2. nd. : Chapters 27. , . 28, 29, 33, 37. 3. rd. : Chapters 30, 31, 32, 39. Final: Chapters 41, 44, 45, 46, 47, 49, 50. Grading system. 100-90…..A. 4. Population and Evolutionary Genetics. lachance.joseph@gmail.com. https://. popgen.gatech.edu. /. COMT. (. catechol-O-methyltransferase. ) and test-taking anxiety. What is wrong with this claim?. Case Study #1.