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Francesco Redi’s Experiment Attempting to Disprove Spontaneous Generation

1626 -1697. Experiment done in 1668. Francesco Redi’s Experiment Attempting to Disprove Spontaneous Generation. Common Beliefs of the Time. Frogs and Turtles come from mud and rotting wood. Mice come from straw. Flies come from rotting meat.

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Francesco Redi’s Experiment Attempting to Disprove Spontaneous Generation

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  1. 1626 -1697 Experiment done in 1668 Francesco Redi’s Experiment Attempting to Disprove Spontaneous Generation

  2. Common Beliefs of the Time • Frogs and Turtles come from mud and rotting wood. • Mice come from straw. • Flies come from rotting meat. • Most of these ideas remained from the time of Aristotle. Why would people believe this? The belief that LIFE can come from NON-LIVING things is called: SPONTANEOUS GENERATION

  3. Redi’s Experiment: Redi observed that flies often appeared on and around rotting meat. So, he placed rotting meat in three jars.

  4. Step One: • Jar-1 Left Open • Maggots developed • Flies were observed laying eggs on the meat in the open jar

  5. Step Two: • Jar-2 Covered with Netting • Maggots appeared on the netting • Flies were observed laying eggs on the netting

  6. Step Three: • Jar-3 Completely Sealed • No maggots developed

  7. This was the first experiment that proved BIOGENESIS “Life can only originate from pre-existing life” Was not accepted as the most plausible theory until 1861, based on experimental data by Louis Pasteur

  8. LOUIS PASTEUR’s experiment: • Filled a flask with broth • Heated the broth to kill all life • Drew out the neck of the flask to make a long S (this prevented micro-organisms in air from entering flask, yet allowed air to flow freely) • If swan neck was broken, microbes entered the flask and grew

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