Specialisation

• Differential gene expression


  1. Stimulus acts on unspecialised cells

  2. Activator and repressor molecules bind to promoter regions on the DNA sequence.

  3. Some genes become switched on and active

  4. Other genes are switched off

  5. Active genes are transcribed to produce RNA

  6. mRNA is translated on ribosomes to produce protein
• Chromatin structure


  Can be made more or less open to being freely transcribed by changing the structure.
• Protein


  Has the ability to change the structure and function of cells
• Differential gene expression allows cells to become specialised