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DNA replication (After the DNA molecule has been unwound and unzipped…

- - - - 5' to 3' direction
        
        Uses each single strand of unzipped DNA as a template
  - - - These are later joined
      - This is catalysed by ligase enzymes
- - - - Example of point mutation
  - - - Different versions of a particular gene
        
        Alleles
        
        Gene variants
- - - - The double helix is untwisted
        
        This is catalysed by a gyrase enzyme.
    - - Hydrogen bonds between the nucleotide bases are broken
        
        This is catalysed by DNA helicase
        
        Two single strands of DNA with exposed nucleotide bases
- - - - Unwinds
        
        Complementary nucleotides join to the exposed nucleotides
        
        The whole loop is copied eventually
      - Unzips