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Monday, August 26 th , 2012 TAKE OUT YOUR NAME PLATE AND YOUR BINDER

Monday, August 26 th , 2012 TAKE OUT YOUR NAME PLATE AND YOUR BINDER. Target Covered: I. I will apply the concept of evolution by natural selection to examples and scenarios. What are we doing today? Read Bed Bug Article What is a theory? Discuss data from Friday

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Monday, August 26 th , 2012 TAKE OUT YOUR NAME PLATE AND YOUR BINDER

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  1. Monday, August 26th, 2012TAKE OUT YOUR NAME PLATE AND YOUR BINDER • Target Covered: I. I will apply the concept of evolution by natural selection to examples and scenarios. • What are we doing today? • Read Bed Bug Article • What is a theory? • Discuss data from Friday • Discuss Natural Selection • Discuss Natural Selection Scenarios in groups • Announcements/Reminders • Don’t worry about diagrams for this unit. • See my wiki for homework • I will be checking things in Wednesday

  2. What is a theory • What is a Theory Video Clip

  3. Change places so that you are not with anyone from your Friday group. Bring your nameplate • Discuss Data from Friday • What factors came into play that influenced predator success? • What factors came into play that influenced prey success? • If all of your predators were knives, what would have happened?

  4. Evolution & Natural Selection • Our first unit in AP biology is the fundamental, unifying concept of biology (and BIG IDEA #1): Evolution • The mechanism used to explain how populations of organisms evolve is called Natural Selection • Natural Selection requires: • VARIATION within a population for one (or many) traits • SURVIVAL of some variations more than others in a specific environment • REPRODUCTION of those within the population who survive • Differential survival and reproduction in a population means a group of organisms within a population in a given environment has a selective advantage.

  5. The Armadillo Story Extant organisms possess selective advantages for the environment in which they live.

  6. The Armadillo Story The environment determines whether or not the armadillo’s behavior has a selective advantage.

  7. Natural selection concepts you should know & use! • VARIATION • SELECTIVE PRESSURE or ENVIRONMENTAL PRESSURE • SELECTIVE ADVANTAGE • SURVIVE & REPRODUCE • ADAPTATION • SPECIATION

  8. Evolution by the Process of Natural Selection Population is well Change in allele frequency within a population is called Use the words below to fill in the flow chart: Environmental Over a (long) period of time (can use twice) Favorable Variation(s) Meiosis & crossing over Speciation Selected For ( fitness) Selection Pressure Unfavorable Variation(s) Adapted Sexual Repro. (random fertilization) Mutation Biogeography Microevolution Selected Against ( fitness) Variation of alleles in a population Isolation Mechanisms PolymorphismMacroevolution Pre & Post zygotic biodiversity

  9. Evolution by the Process of Natural Selection Random mutation Favorable variation(s) Population is well Change in allele frequency within a population is called polymorphisms ADAPTED environmental 4. Selected for (more likely to survive & reproduce; have  fitness) VARIATION (of alleles in a population) OVER A PERIOD OF TIME Meiosis & Xing over selection pressure(s) MICROEVOLUTION Sexual Reproduction (random fertilization) Biogeography & Isolation mechanisms: Pre & post zygotic Unfavorable variation(s) Selected against (LESS likely survive & reproduce; have  fitness) OVER A LONG TIME Use the words below to fill in the flow chart: Environmental Over a (long) period of time (can use twice) Favorable Variation(s) Meiosis & crossing over Speciation Selected For ( fitness) Selection Pressure Unfavorable Variation(s) Adapted Sexual Repro. (random fertilization) Mutation Biogeography Microevolution Selected Against ( fitness) Variation of alleles in a population Isolation Mechanisms PolymorphismMacroevolution Pre & Post zygotic Macroevolution & speciation biodiversity

  10. Discuss your organism with your group • What does it need to survive? • Does it have any special characteristics that help it to get those things? • Pick one from your group to write about how natural selection may have been at play. Use the next slide to help you.

  11. Write how a trait one organism at your group has may have evolved by Natural SelectionUse ALL the terms below and underline terms in your definitionLimit your explanation to no more than FOUR sentences Each group member should write one sentence. Turn in group copy.You are allowed to use a term more than once in your explanation • Offspring • Reproduce • Environment • Selective pressure • Over time • Adaptation(s) • Favorable (select[ed] for) • Unfavorable (select[ed] against) • Variation(s) • Population • Survive (survival)

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