BILD 3 Lecture Notes - Lecture 3: Tetrapod, Tiktaalik, Macroevolution

• School: UCSD
• Department: Biology/Lower Division
• Course: BILD 3
• Professor: Sarah Stockwell

Document Summary

Any trace of an organism that lived in the past (usually found in layers of sedimentary rock) Principle of stratigraphy: deeper you go, older the organism. Used to test evolutionary hypotheses about where fossils will be. Reveals timing of evolutionary events (through fossil layers) Organisms with characteristic of both ancestral and modern forms. Tiktaalik rosae: transition from water (fish) to land (tetrapod) Fish (385 mya) to tetrapod (365mya) --> look for fossils in. Most likely a relative of the ancestor of common tetrapods. Neil shubi: rocks from 375 mya in canadian arctic. Arcaheopteryx: transition between dinosaurs and birds (don t fly) Succession: fossils from one region are similar to extant organisms. Functionless organs in one species that have an important function in another. Species with no use of these organs evolved from other species that had an. Mexican tetra vs blind cave tetra: eye organ. Goose bumps: humans are now hairless: homologous structure.