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Evidence of Evolution

Evidence of Evolution

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Evidence of Evolution

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  1. Evidence of Evolution • Fossils : • Preserved remains of a REAL organisms. • A fossil is not a the actual bone, the bones get buried and mineral deposits take their place over time. • Actual record of past life forms • Able to “date” and link lineages • Older fossils are in deeper layers of rock • Carbon dating used to estimate age

  2. Evidence of Evolution • Molecular Similarities • All organisms’ DNA is made up of the same four nucleotides (A-T, G-C) • All organisms are structurally made up of the four organic compounds: nucleic acids, carbohydrates, proteins, and lipids • Species that share a more recent ancestor have fewer amino acid differences in their proteins • Shows same relationships from fossils

  3. Molecular Similarities: Hemoglobin

  4. Evidence of Evolution • Homologous Structures / Similar anatomy: • Similar body structures/bones with different functions

  5. Evidence of Evolution • Similar vertebrate embryos: • Early in development, vertebrate embryos have similar characteristics • In the individuals above, there is a gill pouch present in each vertebrate. However, that does not mean that humans have gills because we don't. It is really thyroid glands, not gills that is in humans. Comparative embryology shows species with similar ancestors.

  6. Which one is human? 1 2 3 4 5 6 7 8

  7. Which one is human? 1 2 3 4 5 6 7 8

  8. Which one is human? 1 2 3 4 5 6 7 8

  9. Did you guess?

  10. Evidence of Evolution

  11. Practice Questions in Review Book Page 171 & 172 Questions 13, 14, 16 and 26 While answering multiple choice please underline key words, write what you know and cross off answers you know are wrong. Page 173 Question 41 Before answering question 41 read the section in the book entitled Natural Selection on page168. Write the answer on the sheet provided. Use full sentences after each bullet!