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Transcript
Putting It All Together HW on your desk. Write in complete sentences! Don’t talk during the Catalyst! Catalyst Owls have a gene that makes them brown or black. Mice (owl’s prey) can see brown owls better. 1. What is the environmental pressure? 2. What will happen to the gene that causes owls to be brown? 3. EXPLAIN your answer to #2. 4. What causes the difference in owl color? Agenda Catalyst Review What did we learn?! Poker Face QQT Review Sheet EQ Owls have a gene that makes them brown or black. Mice (owl’s prey) can see brown owls better. 1. What is the environmental pressure? GOOD answer: The environmental pressure is how well the mice can see the brown owls. (May be due to the amount of light, the background, etc.) INCORRECT: Color of the owl. Owl’s gene. Owls have a gene that makes them brown or black. Mice (owl’s prey) can see brown owls better. 2. What will happen to the gene that causes owls to be brown? GOOD answer: The gene that causes owls to be brown will decrease in frequency. Owls have a gene that makes them brown or black. Mice (owl’s prey) can see brown owls better. 3. EXPLAIN your answer to #2. GOOD answer: The gene for brown owls will decrease in frequency because their prey can see them better, so they will not be as good at getting food. If they have trouble getting food, their chance of survival decreases and their chance of having offspring decreases. Therefore, the amount of genes passed on decreases. Owls have a gene that makes them brown or black. Mice (owl’s prey) can see brown owls better. 4. What causes the difference in owl color? GOOD answer: Mutations cause the variation in owl color! EVOLVE http://www.5min.com/Video/How-EvolutionHappens-4804307 Evolution Theories LAMARK SEZ… Organisms can force themselves to adapt Acquired characteristics are inherited DARWIN SEZ… Random mutation Environmental pressure Natural selection Evolution Natural Selection SURVIVAL rate Chance of OFFSPRING GENE FREQUENCY SURVIVAL rate Chance of OFFSPRING GENE FREQUENCY Natural Selection GOOD mutations INCREASE fitness. Become MORE common. BAD mutations DECREASE fitness. Become LESS common. THINK ABOUT: Environmental Pressure Prey/Food source Population change Mutations Predators Population change Mutations Physical Environmental Amount of light Background Weather Evidence for Evolution All living organisms contain DNA that is made of the same 4 bases. COMMON ANCESTOR! More DNA they share = More closely related If an organism shares 50% of its DNA with Animal A and 77% of its DNA with Animal B. It is more related to animal B Fossils Where is the oldest fossil? Where is the most complex fossil? Where would you find a transitional fossil between a fossil found in layer A and C? Where would you find a transitional fossil between a fossil found in layer D and B? Compare the fossils in layer D to the fossils in layer B. A B C D E Homologous Structure What it is: Same structure, same position. What it proves: Recent common ancestor. Animal Embryos What it is: Beginning stage of organism development. All have gill slits and tails. What type of structure: Homologous. What it proves: Common ancestor. Analagous Structure What it is: Same structure. What it proves: Adaptations evolved in response to similar environments with similar environmental pressures. (No recent common ancestor.) Vestigial Structure What it is: Useless structure. What it proves: Ancestors used to live in a different environment. (Structure took up too much energy and didn’t increase fitness, so it’s role was decreased.) Quiz-Quiz-Trade Find a partner. Quiz them with your question on your flashcard. If they can’t get it right, coach them (coaching is not telling them the answer). Then your partner quizzes you. Once you have each successfully answered your question, trade your flashcards. Then raise your hand. High-five someone with a raised hand. BAM! You’re now partners. Poker Face The team with the most people standing gets to answer the question. Ms. Sanacore will call on the team member who will answer the question. If THE PERSON CALLED ON gets it right, the team earns one point for each person standing. If THE PERSON CALLED ON gets it wrong, the question goes to the other team. If someone is talking or calls out, their team will lose one point for each person standing. GET GOING ON THE REVIEW SHEET! NOW is the time to ask questions. Write in complete sentences! Exit Questions Sharks in the Gulf have big or small fins. They eat fish, which also have fins. Sharks and fish do not share a recent common ancestor. Since June, the number of fish has decreased. Don’t talk during the Exit Question! 1. 2. 3. 4. What is the environmental pressure? What will happen to the gene frequency of the sharks with small fins? SUPPORT your answer. What type of structure are the fins? EXPLAIN how this structure supports evolution.