Where does life come from
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Where Does Life Come From? PowerPoint PPT Presentation


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Where Does Life Come From?. Origins of Life (pre-19 th c.). Abiogenesis. Heterogenesis. Lao-Tzu. Francisco Redi (1668). Lazzaro Spallanzani (1768). Louis Pasteur (1864).

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Where Does Life Come From?

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Where Does Life Come From?


Origins of Life (pre-19th c.)

  • Abiogenesis

  • Heterogenesis


Lao-Tzu


Francisco Redi (1668)


LazzaroSpallanzani (1768)


Louis Pasteur (1864)


“Never again will the doctrine of spontaneous generation recover from the mortal blow struck by this simple experiment”


Darwin


A.I. Oparin (& David Haldane)


Primordial Soup

4.4 bya

Oceans have pH of 5.8

Present: CH4, NH3, H2O, H2S, CO2, CO

Absent: O2 or O3

Highly reducing atmosphere leads to synthesis of amino acids


Stanley Miller (& Harold Urey) 1953


Sidney Fox

Origin of

Coacervates (protocells)


Oxygen Revolution

2.2 bya

Caused not only metabolic transition but mass extinction


Endosymbiont Hypothesis (Margulis 1981)


Sexual Reproduction


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