Class 12 Biology Inheritance Variation MUTATION


  • Mutation is any change in DNA sequence.
  • It is a heritable change.
  • Mutations can affect genotype as well as phenotype.
  • It also leads to variations.
  • Types of mutations: Point mutations, frame-shift mutations.
  • Mutations that occur due to change in a single base pair of DNA is called as point mutations. For example: sickle cell anemia
  • When there is deletion or insertion of base pairs of DNA, it causes frame-shift mutations.
  • Mutagens are the chemical and physical factors that induce mutations. UV rays can also cause mutations.

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