Dictionary > Transversion


noun, plural: transversions
(genetics) A small-scale mutation characterized by the replacement of a purine by another pyrimidine (e.g. A → C) or a pyrimidine by another purine (e.g. T → G)
In genetics, transversion is a type of mutation. Mutation is defined as a change in the nucleotide sequence of a gene or a chromosome. Based on the effect of mutation on the gene structure, mutations may be: (1) small-scale mutations or (2) large scale mutations. Small-scale mutations are a type of mutation where one or few nucleotides of a gene are affected. They are further classified as follows: (1) substitution mutations, (2) insertion mutations, and (3) deletion mutations. Substitution mutations are a type of mutation in which a nucleotide is substituted with a different nucleotide. Depending on the type of nitrogenous base involved, this type of mutation may be categorized as transition or transversion. A transition is a substitution of a purine nucleotide by another purine (A → G), or of a pyrimidine by another pyrimidine (C → T). In contrast, transversion is the substitution of a purine by a pyrimidine, or of a pyrimidine by a purine.
Since transversion mutation involves only one nucleotide, it may also be a sub-type of point mutation.

See also:

  • point mutation
  • small-scale mutation
  • substitution mutation

    You will also like...

    Early Mammals on Earth
    Early Mammals on Earth

    The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..

    Flowers and tiny fruits of the pomegranate plant
    Fruits, Flowers, and Seeds

    This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..


    Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

    Lights' Effect on Growth
    Lights’ Effect on Growth

    This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

    Consciousness and behavior
    Consciousness and Behavior

    Human consciousness and behavior are an interesting topic since they are determined and controlled by the brain. Conscio..

    genes controlling growth and development
    Control of Growth & Development

    Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..