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Day 4 Objective: Explain how biological evolution is the consequence of the interactions of genetic variation, reproduction and inheritance, and natural selection and time. Agenda: 1. Stamps 2. Variation Lecture 3. Variation Lab This is an example of variation in dogs. List examples of variation within other species. Darwin’s Ideas • Heritability – traits passed from parents to offspring • Variation – differences within a species • Natural selection – some traits are favorable Heritability • Heritable traits: differences in appearance due to genes. Examples: • Non-heritable traits: differences in appearance not due to genes. Examples: Where does genetic variation come from? 1. Sexual reproduction: crossing over 2. Mutations: mistakes in DNA replication or environment How do we observe variation? Monogenetic trait: only two possible appearances Polygenic trait: many possible appearances Exit Ticket 1. What type of trait is shown in these graphs? 2. Do individuals or populations evolve? Defend your answer. How Many Chromosomes? • Human: __________ • Chimpanzee: ______ • Dog: __________ Butterfly: __________ Mosquito: __________ Pine tree: __________ • Cat: __________ • Cow: __________ Cucumber: __________ Record for least # chromosomes: ________ • Trout: __________ Record for most # chromosomes: ________ Conclusions?