Oparin`s and Halden`s Theory (Biochemical origin of life)

Gradual transformation (transmutation) of inorganic compounds to organic compounds and organic compounds to proto cell (life) is called Biochemical origin of life.

Major steps:

  1. Chemogeny:
    It is the process of gradual transformation of inorganic compounds to organic compounds. There are its Five sub-units:-

    1. Formation of water, methane, Ammonia and Cynamide.
    2. Formation of hydrocarbons.
    3. Formation of sugar, amino acids and fatty acids.
    4. Formation of oxy & hydroxyl derivatives of hydrocarbons.
    5. Formation of purines, pyrimidines and nucleotides.


  2. Biogeny:
    Gradual transformation of organic compounds to protocell (life). 3 Steps are:-

    • Formation of nuclei acids.
    • Formation of co-acervates.
    • Formation of proto cell.


  3. Cognogeny:
    Diversification of protozoa into metazoa and metaphyta and various characters.