Important Theories Related to Evolution

Aug 9 2016 • UPSC Exam, UPSC NCERT Books • 697 Views • No Comments on Important Theories Related to Evolution

Important Theories Related to Evolution

Important Theories Related to Evolution

Important Theories Related to Evolution

Some Important theories related to Evolution

 

  • Theory of Inheritance of acquired characters

 

      • This theory was given by Jean Baptiste de Lamarck.
      • This theory is also known as Lamarckism.
      • According to this theory the characters acquired by the Body cells which are also known as Somatic cells in a given generation are passed to next generation.
      • These characters are passed by the process of “Inheritance”.
      • This theory was rejected by August Friedrich leopold Weismann.
      • He gave instances of Giraffe,Aquatic birds and flatfishes in support of his theory.

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  • Germ Plasm Theory

 

      • This theory was given by weismann.
      • According to this theory Human Body is made up of two types of cells-Somatic cells and Germ cells.

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Somatic cells-

  • These cells  are the Body cells.
  • These are also known as Vegetal cells.
  • These participate in body formation process.
  • These cells can not participate in reproduction.

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Germ cells-

  • These cells are known as sex cells.
  • These Participate in reproduction.
  • For Male –Sperm
  • For Female- Ovum

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