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Date: April 18, 2016 Aim #74: How does adaptive variation lead to survival of an organism? Do Now: Warm-Up Notebook Date Title of Activity 4/11 Phylogenic Tree HW: 1)Unit 7d due Friday, April 22nd • Do not forget Castle Learning!! Page # Aim #74: How does adaptive variation lead to the survival of an organism? 1) Variation DIFFERENCES (in structure and or behavior) within a population 2) What produces variations? • Sexual reproduction recombination of genes • Meiosis • Crossing over • Independent assortment – different gametes made by one parent • Mutations 3) Why are variations important to a population? • Variation in a species increases the chances that some members will survive an environmental change. • Why is this important? Peppered Moth (~2 minutes) https://www.youtube.com/watch?v=LyRA807djLc 4) For example: The peppered moth 5) Adaptation A variation that allows an organism to survive in it’s environment 6) Adaptive Variation A variation that allows you to survive a changing environment 7) What would happen to a population with variation if the environment changed? • Those who had an adaptive variation would survive. Those that don’t will die. This would lead to …. EVOLUTION 8) What would happen to a population that did not have variation? • If they don’t posses a trait that allows them to adapt to a changing environment, they will die out: EXTINCTION 9) What is the theory of evolution? • Theory – well tested conclusion that has been accepted by the scientific community. • Evolution : 1) The process by which species change over time. 2) Present day species are related to ancient species. Summary Questions: 1) The driving force behind evolution is the interaction between the individual organisms and the __________. 2) In your own words, define what an adaptive variation is? 3) Explain what the following statement means, “Individual organisms do not evolve, species do”.