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EVIDENCE OF EVOLUTION

EVIDENCE OF EVOLUTION. Evidence for evolution exists in the following: Fossils Homologous structures Vestigial organs Embryology Comparative biochemistry. 1. Fossils – preserved remains of organisms. May be :. Imprint. Mold. Petrified. Amber.

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EVIDENCE OF EVOLUTION

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  1. EVIDENCE OF EVOLUTION

  2. Evidence for evolution exists in the following: Fossils Homologous structures Vestigial organs Embryology Comparative biochemistry

  3. 1. Fossils – preserved remains of organisms. • May be : Imprint Mold Petrified Amber

  4. Fossils are a record of living organisms. • Fossil evidence cannot be disputed. • Fossils are found in sedimentary rock. • Fossils are dated by two methods: • 1. Relative dating – estimated date of fossil according to rock layer in which the fossil • was found. • 2. Radiometric dating – more exact date based on the rate at which radioactive material in the rock decays.

  5. Homologous Structures • Found in vertebrates. • Similar bone patterns that suggest common ancestry. • Function of the structure may or may not be the same. Grasp Climb Fly Swim Run

  6. Vestigial Organs • Structures that no longer have a function and are therefore • disappearing. IE. “Use it or Lose it”. • Ex. 1 – Whale feet • Remnants of feet remain on the • whale skeleton from when the • ancestors of whales walked on land. Ex. 2 – Human tail bone (coccyx)

  7. Embryology • Early stages of embryonic development in a variety of organisms • that suggests common ancestry. • All have: • *Pharyngeal pouch which • become gills in fish & • amphibians. • *Tail • *Buds that become limbs. As organisms grow & develop, new instructions are layered on old ones. Tail and gills become relics and disappear in humans.

  8. Comparative Biochemistry • DNA – only 4 nitrogen bases in all forms of life. • - structure of double helix. • - record of evolution. • Key molecules such as enzymes and hemoglobin. • Like processes such as respiration, glycolysis, photosynthesis

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