But it’s easier to say unrelated than it is to say “organisms with no recent common ancestor” over and over. Unrelated* (with a star) because no organisms are ACTUALLY unrelated, given that we all descended from the same original organism.
If organisms they live in similar environments, they will evolve similar structures. Anatomy = body structure Remember, the theory of evolution tells us that all life branched off from one original species (red circle) and the more closely two organisms are related, the more recently they shared a common ancestorħ Analogous Structures Analogous structure: parts of different species that have the same function, but EVOLVED SEPARATELY Key Point #1: Analogous structures show that unrelated* species will evolve similar adaptations in response to similar environmental pressures Natural selection selects for (keeps around) mutations that increase fitness in the specific environment.
If you’re worried about time, skip the homework review and do it on Thursday (review day for unit test)Ħ Comparative Anatomy Scientists can compare the anatomy of different organisms to figure out how closely they are related. This is evidence that all animals evolved from the same common ancestor. If you’re worried about time, skip the homework review and do it on Thursday (review day for unit test)ĥ Catalyst Review What are two things all animal embryos have in common? What does this tell us about how animals evolved? All animal embryos have gill slits and tails. This shows that humans and cows evolved from a common ancestor with a four- chambered heart. What type of structure is this, and what does it tell us about how humans and cows evolved? It is a homologous structure. Objectives By the end of today, all SWBAT… Explain how analogous structures support the theory of evolution Explain how vestigial structures support the theory of evolutionģ Agenda Review Structures Guided Practice Independent Practice/HomeworkĪnalogous Vestigial Guided Practice Independent Practice/Homework Closing Exit QuestionsĤ Catalyst Review Humans and cows both have hearts with four chambers. What type of structure is this, and what does it tell us about how humans and cows evolved? What are two things all animal embryos have in common? What does this tell us about how animals evolved? Write in complete sentences! Don’t talk during the Catalyst! Catalyst Humans and cows both have hearts with four chambers.
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