Presentation on theme: "Focus Lesson Please grab a new focus lesson from the front desk"— Presentation transcript:
1Focus Lesson Please grab a new focus lesson from the front desk 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.
2Home 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’TYou 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!
3Daily ObjectivesSWBAT 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.
4Page 22: Modeling Natural Selection Last ClassThis ClassPage 22: Modeling Natural SelectionAbsent? You owe me pre-lab questions. Use my data to answer the analysis and conclusion questions.Home Learning:Quiz 2 and 3Finish Page 22Page 23: Notes Darwin & Natural SelectionPage 24: Diagramming the Principles of Natural SelectionPage 25: H.W. Natural Selection
5Page 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.
6Analysis and Conclusion How many brown mice were produced in the first generation?How did the proportion of brown mice produced in the third and fourth generations compare to your first generation?Which allele, W or w, was removed from the gene pool by predation? EXPLAIN.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.
7Applying VocabularyYou 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 SelectionOnce you’ve updated your T.O.C. open to page 23, drop your writing utensils, and look up.
8Darwin1831, HMS BeagleExpedition from England to map coast of South AmericaCharles Darwin observed differences among island species.He began to perceive adaptation to the environment and the origin of new species as closely related processes.
9Natural Selection Notes Natural Selection What is natural selection?When an adaptation/characteristic allows one organism to survive and reproduce better than othersThe 4 main principlesof natural selection are:Variation:Overproduction:Adaptation:Descent with modification:Have students open to page 306 in the biology textbook and fill in each of the four boxes. Come back as whole group and discuss each.
10Have students follow along in the book on pg 307 Have students follow along in the book on pg 307. Use jaguars to explain how natural selection works with each of the four principles.
11VariationPhenotypic and Genotypic differences that result from recombination or mutation.
13PEPPERED MOTHS pre-industrialization Which moth would be more fit? WHY???
14PEPPERED MOTHS post-industrialization Which moth would be more fit? WHY???
15OverproductionMore offspring= better chance one of your offspring will survive to reproductive ageBUT more offspring also equals more competition
16Adaptation: 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.
17Descent with modification Heritable traits- traits that can be passed down through generationsFavorable 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.
18Page 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.
19Artificial Selection Selection of traits determined by humans Ex – breeds of dogs, cats, crops, or birdsNot determined by the environmentGo through this slide quickly.. You should mention it but it’s not terribly complicated or heavily tested
20Independent Practice Complete the independent practice The critical thinking question is theMost important question on this sheetShow me what you’re made of!!!