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Download Evidence of Evolution: Comparative Embryology
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Name: _______________________________________ Period: _______ Evidence of Evolution: Comparative Embryology Organisms that are closely related may have physical similarities before they are even born. Take a look at the six different embryos below: 1. Hypothesize which embryo is from each of the following organisms: Species Embryo Human Chicken Rabbit Tortoise Salamander Fish These are older, more developed embryos from the same organisms. 2. Hypothesize which embryo is from each of the following organisms: Species Human Chicken Rabbit Tortoise Salamander Fish Embryo These embryos are at their most advanced stage, shortly before birth. 3. Describe how the embryos changed for each of these organisms from their earliest to latest stages. Species Anatomical Changes From Early to Late Stages Human Chicken Rabbit Tortoise Salamander Fish 4. Look again at the six embryos in their earliest stages. Describe the patterns you see. What physical similarities exist between each of the embryos? 5. Does this suggest an evolutionary relationship? Explain how these embryos can be used as evidence of a common ancestor between each of these six organisms. Embryological Development: http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html Make a prediction: Do you think other organisms will have a similar embryologic development as humans? Explain your reasoning. For each of the embryos shown, try to guess which organism it will become. 1. Embryo 1 – a. What was your first prediction? ___________________ were you correct? __________ b. Watch the development of the embryo. On which day does the embryo begin to look different from other embryos? _______ 2. Embryo 2 a. What was your first prediction? ___________________ were you correct? __________ b. Watch the development of the embryo. On which day does the embryo begin to look different from other embryos? _______ 3. Embryo 3 a. What was your first prediction? ___________________ were you correct? __________ b. Watch the development of the embryo. On which day does the embryo begin to look different from other embryos? _______ 4. Embryo 4 a. What was your first prediction? ___________________ were you correct? __________ b. Watch the development of the embryo. On which day does the embryo begin to look different from other embryos? _______ 5. Was your prediction at the beginning of this activity correct? Explain your answer. Use at least one observation that you made during this activity to support your answer.
