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DNA recombination (benefits (increaes heterozygosity, immunoglobulin genes…

- - - - joins two DNA segments with short but specific sequences present on both participating DNAs
      - recombination only occurs at these sites
      - process is catalyzed by recombinases
      - example: recombination of immunoglobulin genes, this is called V(D)J recombination
    - - transposons are DNA segments that can move from one DNA molecule to another
      - process is catalyzed by transposases
      - example: the integration of HIV-1 virus occurs into the human genome through a "transposition" mechanism, also bacterial resistance to antibiotics often results from transposition of genes from bacterial plasmids