Name:_______________________ Guess the Embryo Visit the following site (http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html) (Open it in Internet Explorer) to learn about why studying similarities in embryo development provides additional evidence of evolution. Directions: “launch” the interactive by right-clicking and open in a new tab. Read the introductory paragraph and answer the following questions: 1. How do all animals start out? ________________________________________________________________________________________ ________________________________________________________________________________________ 2. What 3 things happen as the fertilized egg goes on to its next stage a. b. c. 3. What do the genetic instructions tell the embryo to do? ________________________________________________________________________________________ ________________________________________________________________________________________ 4. Why do embryos of the same species appear similar to each other? ________________________________________________________________________________________ ________________________________________________________________________________________ 5. Visit the following website (https://sciencing.com/difference-between-natural-selection-descentmodification-17942.html) , scroll down to “How Descent with Modification Works” and define descent with modification along with the 3 mechanisms that can change the genetic code. Descent with Modification – __________________________________________________________ __________________________________________________________________________________ Mechanisms o o o Click on the arrow below the embryo and on the next page, look at the “embryo in question” and make a hypothesis of which organism you think it is and explain why you guessed this. Use the data table at the bottom on the back to document your predictions and ideas. Examine the slide sequence that shows the development of the organism and describe 2 important feature that you noticed during development that detail what the organisms is and when they occurred. Complete the rest of the data table for the other 3 embryos. Observing Embryo Development: Embryo #1 My hypothesis Reasons for my prediction This is what it actually is… 2 important features noticed about this development and days they occurred #2 #3 #4 Extension Go to Schoology Third Quarter Day 13 watch the video titled “” and answer the following questions. 1. Who was Ernst Haeckel? How did his work contribute to Charles Darwin's Theory of Evolution? __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. What did Haeckel's drawings show? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. All animals come from a common ________________________. 4. What was the problem with Haeckel's drawings? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 5. One of the main points of Haeckel's drawings is that the more closely related embryo forms shared a more recent common ancestor. Going back to the embryos you viewed what two do you think share a more recent common ancestor and provide an explanation why using specifics from the embryo pictures. __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ 6. Another important idea from Haeckel's drawings that scientists have held up over the years is that within closely related forms, earlier stages will be more similar than late stages. Do the embryos you viewed agree with this idea? Explain by using evidence from the embryos you viewed. __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ Application Writing prompt: Why is the study of embryology used to strengthen the evidence we have about the evolution of species? How does embryology support the theory of “descent with modification”? Use the data from your table and your notes from the PowerPoint and video to help strengthen your response. __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________ __________________________________________________________________________________________________
