ME Sci 10 Q3 1602 PS (1)
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Title
Quipper Lesson 16.2: Comparative Anatomy
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Learning Competency
Explain how fossil records, comparative anatomy, and genetic information provide evidence for evolution (S10LT-IIIf-39).
Goal to meet the DepEd learning competency by the end of the lesson.
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Learning Objectives
At the end of this lesson, learners should be able to:
Differentiate among homologous, analogous, and vestigial structures.
Cite examples of these structures in organisms.
Discuss the role of comparative anatomy in the study of evolution.
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Title
Quipper Comparative Anatomy
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Definition of Comparative Anatomy
Comparative anatomy studies similarities in structures among different organisms and how they function, indicating interrelation.
Importance in understanding evolution.
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Warm-Up Activity
Download and print vertebrate bones from the study guide.
Observe bone appearances and structures.
Relate structure to function and answer related questions.
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Evidence of Evolution
Body parts and structures serve as evidence of evolution.
Similarities in body structures suggest indirect relationships between organisms.
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Structures Providing Evidence
Relationships between structures of organisms serve as evidence for evolution.
Types of structures: homologous, analogous, and vestigial.
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Homologous Structures
Definition: Body parts of different organisms with similar forms but different functions (e.g., human arms, whale flippers, bat wings).
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Evolution of Homologous Structures
These structures may originate from a common source but evolve differently due to varied pressures (e.g., human arms vs. whale flippers).
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Serial Homologies
Definition: Repeating structures within an organism that perform similar functions but have different specializations (e.g., vertebral column composed of vertebrae).
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Homologies and Evolution
Homologous structures indicate descent from a common ancestor.
Example: Tetrapod limbs share bone structure (humerus, radius, ulna), serving different functions.
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Analogous Structures
Definition: Structures with the same function but evolved independently (e.g., wings of insects and birds).
Examples: Bird, bat, and insect wings function for flight but are not derived from a common ancestor.
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Analogies and Evolution
Analogous structures provide limited insight into evolutionary relationships but reflect environmental pressures faced by organisms (e.g., sweet potato roots and potato stems).
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Vestigial Structures
Definition: Organs present in organisms that serve no significant function (e.g., human appendix).
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Vestigial Structures in Different Organisms
Vestigial structures can have significance in one organism and not in another (e.g., human coccyx vs. tailbone in other animals).
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Whales and Vestigial Structures
Whales possess vestigial hind limbs, which are disconnected from their spine, indicating evolutionary history.
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Vestigial Structures and Snakes
Snakes also exhibit vestigial hind limbs, suggesting a descent from lizards as part of their evolutionary history.
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Vestigial Structures in Evolution
Such structures can predict an organism's evolutionary past and suggest common ancestry with similar functioning species.
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Key Points
Homologous structures have similar forms but different functions.
Analogous structures share functions but have different evolutionary paths.
Vestigial structures are present but non-functional organs.
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Check Your Understanding
True/False: Analogous structures do not contribute to evolutionary science.
True/False: Vestigial structures have no function.
True/False: Homologous structures exist in related organisms.
True/False: Snakes and whales possess vestigial limbs.
True/False: Homologous structures must have the same function.
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Bibliography (Part 1)
Boundless. “Evidence of Evolution.” Biology. Accessed September 28, 2016.
Evolution FAQs. “Five Proofs of Evolution.” Accessed September 1, 2016.
Formaro, Amanda. 2016. “Coffee Ground Fossils.” Accessed September 28, 2016.
Lemon, Traci. “Your Hands, My Feet, My Fins, My Wings Our Bones!” Accessed September 1, 2016.
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Bibliography (Part 2)
The National Academy of Sciences. 1999. “Evidence Supporting Biological Evolution.” Science and Creationism: A View from the National Academy of Sciences, 2nd ed. Accessed September 1, 2016.
Understanding Evolution, Berkeley University of California. “Lines of Evidence: The Science of Evolution.” Accessed September 1, 2016.