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Evolution

Origin of Life & Evolution

Origin of Life

Year

Scientist

Theory/Experiment

Conclusion

1927

Lemaitre

Big Bang theory

The universe expanded from explosion of a primordial, hot substance.

1924 − 1929

Oparin and Haldane

Chemical evolution preceded organic evolution

Simple organic molecules originated from inorganic precursors.

1952

Stanley Miller and Urey

Synthesis of biomolecules by creation of similar conditions as primitive atmosphere on laboratory scale

Amino acids were synthesised from ammonia, oxygen, and carbon dioxide inside specialised apparatus.

Urey and Miller experiment

  • Primitive atmosphere had high temperature, volcanic storms, and reducing atmosphere, containing CH4, NH3, H2, etc.

  • Urey and Miller took the same compounds in a closed flask along with water vapour at 800ºC and created an electric discharge.

  • Formation of biomolecules su...

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