Natural selection

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  • Copy title, date and key words: 5 mins
  • Starter: 10 minutes
  • 10 mins
  • 5 min explanation
  • 15 minutes
  • Natural selection

    1. 1. Natural selection Monday, 17 February 2014 Learning objectives:  To explain what is meant by survival of the fittest.  To analyse the stages in natural selection and be able to give examples.  To evaluate how natural selection in the Galapagos finches helped Darwin formulate his theory. Key words: Survival of the fittest, selective advantage, variation
    2. 2. What are the differences between these two moths? Why might one be better adapted than the other? Extra challenge: How does the environment affect the number of moths of each colour?
    3. 3. Survival of the fittest Use the information from the video to draw a picture explaining “survival of the fittest.” You may only use 2 sentences to explain your picture! http://www.bbc.co.uk/learningzone/clips/na tural-selection-and-survival-of-thefittest/5516.html LO: To explain what is meant by survival of the fittest.
    4. 4. Adaptations • We know that species are adapted to suit their environment (think of the camel and polar bear). • What happens to those which are not well adapted? • This is survival of the fittest.
    5. 5. Darwin’s finches • On his voyage on the Beagle Darwin stopped at the Galapagos islands. • Here he discovered some unique species including and observed a variety of finches.
    6. 6. Darwin’s Finches From one species of finch, several others have evolved over time. Depending on the environment they inhabit, they have evolved adaptations that make them better suited for their niche.
    7. 7. Darwin’s finches Different islands in the Galapagos have different habitats and food types. Discuss: Why might different species of finch exist on different islands? Extra challenge: How did Darwin use natural selection to explain what he saw on the Galapagos? Be ready to share your ideas with the class.  To evaluate how natural selection in the Galapagos finches helped Darwin formulate his theory.
    8. 8. Finches practical • We are going to try and pick up seeds with different sized forceps to model the different sized beaks of Galapagos finches. • Make a prediction, carry out the experiment and then answer the questions. Extra challenge: Why might some finches in the Galapagos have started feeding on foods other than seeds? Explain using your knowledge of natural selection. LO: To evaluate how natural selection in the Galapagos finches helped Darwin formulate his theory.
    9. 9. Homework • Levelled task about Darwin’s theory of evolution Use knowledge from lessons, internet, books etc. to help you. BUT NOT COPYING AND PASTING!! Due 23rd September
    10. 10. Stages in natural selection • Sort the cards into the correct order. Support: Text books, mobiles. Extra challenge: Add some examples of natural selection, you may use text books to help you. LO: To analyse the stages in natural selection and be able to give examples.

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