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    Mutation Theory Short Note | Evolution Class 12 Notes

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    In this article we will discuss about Mutation Theory of evolution :- Experiments of hugo de vries
    and Evidence of mutation theory

    • Hugo de Vries proposed the mutation theory of evolution in 1901
    • Mutation is sudden change occurring in the genetic material
    • According to him, new species are not formed by continuous variations but by sudden appearance of variations

    Experiments of Hugo de vries

    • He conducted his experiments on Oenothera lamarckiana plant
    • He self-pollinated O.lamarckiana and seeds were allowed to grow
    • F1 Generation: Majority similar to parents but a few were different plants
    • Different plants were also self-pollinated and seeds were allowed to grow
    • Next generation majority similar to parents but a few were still more different plants
    • It happened generation after generation
    • These plants appeared to be new species
    • He suggested from his experiments that new species are formed in single step suddenly without any intermediate stage

    Evidence of Mutation Theory

    • ANCON SHEEP: Short legged variety of sheep which appeared suddenly in England in 1791.
      The breed was artificially selected and maintained for its desirable inability to jump over fences.
    • Hornless Cattle developed as mutation from the homed cattle in 1889
    • Hairless cats have developed through mutations

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