Mutation — Definition and Origin

What is a Mutation?

A mutation is a change in the DNA sequence that can affect a gene, chromosome, or whole genome. It introduces genetic variation, which is essential for evolution, but can also cause diseases.

Origin and History of the Concept:

• Early observations (late 19th century):
  The idea that organisms can suddenly change was hinted at by naturalists, but no clear mechanism was known.

• 1901 — Hugo de Vries:
  The term “mutation” was first scientifically used by Dutch botanist Hugo de Vries. He observed sudden changes in evening primroses (Oenothera) that appeared to be new traits inherited by offspring. He proposed mutation as a source of new variation, distinct from gradual evolution.

• 1920s–1940s — Discovery of DNA as genetic material:
  Understanding mutations became clearer after DNA was identified as the molecule of heredity. Mutations were recognized as changes in DNA sequences.

• 1953 — Watson and Crick:
  The discovery of DNA’s double helix structure helped explain how mutations can happen — through errors in DNA replication or damage to the DNA molecule.

• Modern molecular biology:
  Techniques now allow us to detect, analyze, and sometimes even correct mutations.

Summary of Mutation: