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Spontaneous GenerationA belief that living things came from non living things. Example of this myth: Eels came from the slime of river bottoms. Maggots came from decaying meat.
Spontaneous GenerationThese myths were accepted because the scientific method was not used. Two scientists whose experiments disproved spontaneous generation: Francisco Redi Louis Pasteur
Spontaneous Generation(1668) Redi- showed that maggots don’t arise from decaying meat.
Spontaneous Generation1675 Microorganisms were discovered. Some believed that microorganisms arose spontaneously.
Spontaneous Generation1864; Pasteur Hypothesized that “spores” were on dust particles in the air. Developed a way to let air in and keep dust out.
Spontaneous GenerationPasteur’s Experiment: 1) Boiled broth (“infusions”) Formed S shaped neck on flask- allowed air in but not dust & microbes. 3) Tilted one flask until broth touched curve and dust.
Spontaneous GenerationResults: no growth of microbes in upright flask microbes grew in “tilted” flask
Spontaneous GenerationRedi and Pasteur supported the theory of BIOGENESIS new organisms are created from existing organisms.
The Story of Spontaneous Generation
What is Biogenesis? Biogenesis is the principle which sates that all living things come from other living things. Before Biogenesis people believed that.
Spontaneous Generation Before the 17 th century, people believed that living things could come from nonliving things. – The Cell Theory has not been written.
Chapter Asking a Question 2. Forming a Hypothesis (MUST be testable) 3. Setting up a Controlled Experiment 4. Recording and Analyzing Results.
From Spontaneous Generation to the Modern Cell Theory
INTRO TO EVOLUTION. FIRST IDEAS In early times, people believed in spontaneous generation. Spontaneous generation is the belief that something living.
Spontaneous Generation vs. Biogenesis Honors Biology
Spontaneous Generation vs. Biogenesis
Theories about the evolution of organic molecules Year 11:Biology.
INTRODUCTION TO BIOLOGY. How does life begin? There were 2 theories: There were 2 theories: –Spontaneous generation –Biogenesis.
Spontaneous generation vs. biogenesis
1-2 How Scientists Work.
The first microbes were observed in
Microbiology Brief Review Spontaneous Generation and Biogenesis.
End Show 1-2 How Scientists Work Slide 1 of 32 Parts of the Scientific Method Copyright Pearson Prentice Hall.
Thinking like a scientist Galileo Gallilei and his telescope.
Early Scientists. ARISTOTLE Greek philosopher Made observations of the natural world through reasoning. Special “vital” forces brought some living things.
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