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

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

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

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  1. KEY CONCEPT Evidence of common ancestry among species comes from many sources.

  2. 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.

  3. The study of geography provides evidence of evolution. • island species most closely resemble nearest mainland species • populations can show variation from one island to another

  4. Larva Adultbarnacle Adult crab • Embryology provides evidence of evolution. • identical larvae, different adult body forms • similar embryos, diverse organisms

  5. Molefoot Batwing Human hand • 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.

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

  7. 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.

  8. KEY CONCEPT New technology is furthering our understanding of evolution.

  9. Fossils provide a record of evolution. • Paleontology is the study of fossils or extinct organisms.

  10. Paleontology provides evidence to support evolution.

  11. DNA sequence analysis • Two closely-related organisms will have similar DNA sequences.

  12. Pseudogenes are sequences providing evidence of evolution. • no longer function • carried along with functional DNA • can be clues to a common ancestor

  13. Homeobox genes indicate a very distant common ancestor. • control the development of specific structures • found in many organisms • Protein comparisons, or molecular fingerprinting reveals similarities among cell types of different organisms.

  14. Evolution unites all fields of biology. • Scientist from any fields contribute to the understanding of evolution. • The basic principles of evolution are used in many scientific fields.

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