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Focus Lesson Please grab a new focus lesson from the front desk. Use your textbook to find the definitions. You have 5 minutes. Remember our procedures!

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Presentation on theme: "Focus Lesson Please grab a new focus lesson from the front desk. Use your textbook to find the definitions. You have 5 minutes. Remember our procedures!"— Presentation transcript:

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2 Focus Lesson Please grab a new focus lesson from the front desk. Use your textbook to find the definitions. You have 5 minutes. Remember our procedures! Grab your group’s pencil box. Have your id out.

3 Home Learning Last class you were assigned Quiz 2 and 3 In order to get full credit you needed to SRE each question. DO NOT SAY that you CAN’T You are smart, you are capable, and it was open note. I will check your quizzes when I check your notebook- that means if you have not yet completed it- YOU STILL HAVE AN OPPORTUNITY TO DO SO!

4 Daily Objectives SWBAT explain how genetic variation, overproduction of offspring, and struggle for survival affect natural selection. SWBAT explain the concept of adaptation and its relationship to environmental factors.

5 Last Class Page 22: Modeling Natural Selection Absent? You owe me pre- lab questions. Use my data to answer the analysis and conclusion questions. Home Learning: Quiz 2 and 3 This Class Finish Page 22 Page 23: Notes Darwin & Natural Selection Page 24: Diagramming the Principles of Natural Selection Page 25: H.W. Natural Selection

6 Page 22: Finishing our Lab We need to complete our lab. We must complete data collection before we can finish our analysis and conclusion questions. Follow along to complete our data table. You will work independently to analyze this data, and answer the questions on the following slide.

7 Analysis and Conclusion 1.How many brown mice were produced in the first generation? 2.How did the proportion of brown mice produced in the third and fourth generations compare to your first generation? 3.Which allele, W or w, was removed from the gene pool by predation? EXPLAIN. 4.If the main predator of mice in this white-sand desert were an animal that hunted by smell rather than sight, would you expect the same results? Explain your reason.

8 Applying Vocabulary You just modeled a theory known as natural selection. Please open your notebook to your Table of Contents. We will start Page 23: Notes Darwin and Natural Selection Once you’ve updated your T.O.C. open to page 23, drop your writing utensils, and look up.

9 Darwin 1831, HMS Beagle Expedition from England to map coast of South America Charles Darwin observed differences among island species. He began to perceive adaptation to the environment and the origin of new species as closely related processes.

10 Natural Selection Notes Natural Selection What is natural selection? When an adaptation/characteristic allows one organism to survive and reproduce better than others The 4 main principles of natural selection are: Variation: Overproduction: Adaptation: Descent with modification:

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12 Variation Phenotypic and Genotypic differences that result from recombination or mutation.

13 PEPPERED MOTHS: NATURAL SELECTION IN ACTION!

14 PEPPERED MOTHS pre-industrialization Which moth would be more fit? WHY???

15 PEPPERED MOTHS post-industrialization Which moth would be more fit? WHY???

16 Overproduction More offspring= better chance one of your offspring will survive to reproductive age BUT more offspring also equals more competition http://youtu.be/gds666EIx7c

17 Adaptation: Darwin’s Finches Darwin, was struck by the variation of traits among similar species. Each island, which had its own unique environment, had its own version of the finch (with varying beaks) Darwin concluded that species can adapt to their surroundings to better survive over time.

18 Descent with modification Heritable traits- traits that can be passed down through generations Favorable heritable traits, those which make it more likely for offspring to reproduce, will be passed on and thrive. This creates variation from the common ancestor. http://youtu.be/7dx2CUMtZ-0

19 Page 24: Principles of Natural Selection Your textbook used the example of jaguars to explain the principles of Natural Selection. Can you think of how another organism demonstrates these principles? Use your background knowledge, or grab one of the articles at the front of the room, to diagram your own example of an organism that shows ALL FOUR principles of natural selection from our notes. http://youtu.be/ICUsN_OP8gY

20 Artificial Selection Selection of traits determined by humans Ex – breeds of dogs, cats, crops, or birds Not determined by the environment

21 Independent Practice Complete the independent practice The critical thinking question is the Most important question on this sheet Show me what you’re made of!!!


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