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Genes, DNA and Chromosomes, each nucleotide contains, there are 4 bases…

- - - - Phosphate group
        
        Sugar molecule (deoxyribose)
        
        Nitrogen-containing group called a base
        
        Adenine
        
        Thymine
        
        Cytosine
        
        Guanine
        
        Adenine will always pair with Thymine
        
        Cystosine will always pair with Guanine
  - - - The polynucleotide strands of DNA separate
      - Each strand acts as a template for the new formation of a new strand of DNA
      - DNA polymerase assembles nucleotides into two new strands according to the base-pairing rule
      - Two identical DNA molecules are formed, each contains a strand from the parent DNA and a new complementary strand
  - - - Nucleus
      - The part of DNA double helix undwinds and undzips
      - The template strand of DNA forms a framework upon which a molecule of mRNA is formed (the building blocks of mRNA are RNA nucleotides).
      - They line up alongside forming a mRNA molecule.
      - They form bonds between their ribose and phosphate groups, joining together to make the backbone of the molecule.