Where does life come from
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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

Where Does Life Come From?


Origins of life pre 19 th c

Origins of Life (pre-19th c.)

  • Abiogenesis

  • Heterogenesis


Lao tzu

Lao-Tzu


Francisco redi 1668

Francisco Redi (1668)


Lazzaro spallanzani 1768

LazzaroSpallanzani (1768)


Louis pasteur 1864

Louis Pasteur (1864)


Where does life come from

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


Darwin

Darwin


A i oparin david haldane

A.I. Oparin (& David Haldane)


Primordial soup

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

Stanley Miller (& Harold Urey) 1953


Sidney fox

Sidney Fox

Origin of

Coacervates (protocells)


Oxygen revolution

Oxygen Revolution

2.2 bya

Caused not only metabolic transition but mass extinction


Endosymbiont hypothesis margulis 1981

Endosymbiont Hypothesis (Margulis 1981)


Sexual reproduction

Sexual Reproduction


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