10 4 Evidence of Evolution KEY CONCEPT Evidence

10. 4 Evidence of Evolution KEY CONCEPT Evidence of common ancestry among species comes from many sources.

10. 4 Evidence of Evolution Types of Adaptations • Structural Adaptation: Affect the changes in structure of the body (skin color, shape etc. ) • Physiological Adaptation: Affect the way the body functions (metabolism, drug resistance, a molecule made in the body, etc. )

10. 4 Evidence of Evolution Evidence for evolution in Darwin’s time came from several sources. • Fossils provide evidence of evolution. • Fossils in older layers are more primitive than those in the upper layers.

10. 4 Evidence of Evolution Video link • https: //www. youtube. com/watch? v=5 q. The. Ydwd 9 Q

10. 4 Evidence of Evolution • Embryology provides evidence of evolution. – identical larvae, different adult body forms – similar embryos, diverse organisms Larva Adult crab Adult barnacle

10. 4 Evidence of Evolution • The study of anatomy provides evidence of evolution. – Homologous structures are similar in structure but different in function. – Homologous structures are evidence of a common ancestor. Human hand Mole foot Bat wing

10. 4 Evidence of Evolution • The study of anatomy provides evidence of evolution. – Analogous structures have a similar function. Human hand Mole foot – Analogous structures are not evidence of a common ancestor. Fly wing Bat wing

10. 4 Evidence of Evolution Structural patterns are clues to the history of a species. • Vestigial structures are remnants of organs or structures that had a function in an early ancestor. • Ostrich wings are examples of vestigial structures.

10. 4 Evidence of Evolution Genetic Comparisons • Comparison of DNA and Amino Acid sequences provides evidence for Evolution. -It is suggested that organisms with similar DNA sequences may share a relationship or common ancestor.

10. 4 Evidence of Evolution Write the organisms in order in terms of how close you think they are to human. • Elephant, Bacteria, Iguana, Mushroom, Ant, Gorilla, Earthworm, Koala bear, Corn plant, and Pigeon