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Biochemical Theory of Origin of Life
This theory was proposed by two scientists. Alexander Ivanovich Oparin (1923) and J.B.S. Haldane (1928) independently. They stated that the origin of life occured along with the origin and evolution of Earth and its atmosphere. The origin of Life occured from non-living simple molecules, simple molecules formed simple organic compounds, simple organic compounds formed complex organic compounds which then gave rise to the first living cell or pre-cell. This theory is called Oparin-Haldane Theory.The above life process can be explained in three steps-
Chemogeny(Chemical Evolution)
- Formation of Simple Molecules
- Formation of Simple Organic Compounds
- Formation of Complex Organic Compounds
Biogeny(Biological Evolution)
- Formation of Coacervates
- Formation of Primitive Life
Cognogeny(Modification of Life)
- Origin of Heterotrophs
- Modification of Heterotrophs into Autotrophs
