Section 1

Biogenesis

• Before the 1600s, it was generally thought that organisms could arise from nonliving material by spontaneous generation.

• Redi showed in 1668 that rotting meat kept away from flies would not produce new flies. Maggots appeared only on meat that had been exposed to flies.

Vocabulary biogenesis (p. 279)

• Spallanzani showed in the 1700s that microorganisms would not grow in broth when its container was heated and then sealed. He inferred that microorganisms do not arise spontaneously but, rather, are carried in the air.

• Pasteur in the 1800s used a variation of Spallanzani's design to prove that microorganisms are carried in the air and do not arise by spontaneous generation.

spontaneous generation (p. 279)

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