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Natural selection
- 1. NATURAL SELECTION This Photo by Unknown Author is licensed under CC BY-SA-NC
- 2. Contents Standard: HS-LS4-2. Content Objective: Students will learn and discuss the mechanism of natural selection as it relates to evolution. Darwin’s theory Terminology Natural Selection Variation Reproduction Competition Fitness Evolution by Natural Selection
- 3. Padlet Warmup How does the environment influence the survival of an individual? • Use the QR code to get onto Padlet and respond to the warmup questions.
- 4. Charles Darwin • Charles Darwin was a British naturalist proposed theory of evolution by natural selection. – A naturalist studies patterns within nature and impacts of living species on each other and the environment. • In the 1830’s, Darwin set sail on the HMS Beagle on an expedition around the globe. • Galapagos Island – Darwin observed patterns between distinct species of finches
- 5. Think-Pair- Share Why do you believe that these finches may look different? • Write down your observations about the different finches. • Turn to your partner and share your observation.
- 7. Darwin’s Theory of Evolution Use interactive guide to follow along the video.
- 8. Terminology Theory of Evolution • Species evolve over time and all living things come from a common ancestor. Natural Selection • Organisms better adapted to their environment survive and reproduce. • ”Survival of the Fittest”
- 10. Genetic Variation Genetic variation is caused by: Mutation Random mating Crossing over Random fertilization Genetic differences that exist within a population.Variations of a gene that a phenotypically expressed.
- 11. Reproduction Organisms within a species reproduce more offspring than can survive. Species that are more fit will survive and reproduce Reproduction leads to genetic variation of individuals
- 12. Think-Pair-Share How do variations lead to adaptions? • In your science notebook answer the following question. • After discuss with your partner
- 13. Competition Due to increase of population resources will be limited. • Food • Water • Shelter • Mates Individuals within a population will compete with other individuals for resources. Competition can occur within and between species
- 14. Fitness Natural selection acts on an individual’s phenotype. Individuals with high fitness is more likely to survive and reproduce The higher the fitness the more likely the organism will survive to pass on its genes to the next generation.
- 15. USING WHAT YOU NOW KNOW…. How does natural selection play a role in this picture? Use specific vocabulary to support your claim.
- 16. Summary • Charles Darwin founded theTheory of Evolution andTheory of Natural Selection. • Evolution is the process of organisms evolving to their environments over a period of time and all organisms share a common ancestor. • Natural selection is a mechanism of evolution. • For natural selection is possible because of reproduction, variation, fitness, and competition.
- 17. Exit Slip How does the environment influence the survival of an individual? • Use the QR code to get onto Padlet and respond to the warmup questions. • You should use knowledge gained from the lecture to support your claim.