Questions

• What is meant by homeobox gene

  A homeobox gene is a regulatory gene that contains 180 base pairs that code for a homedomain on a protein. It switches genes on and off
• Homeobox genes are very similar throughout animals, explain why these is little mutation in these genes

  These genes are very important so a mutation would have a big effect affecting many other genes so a mutation is likely to be lethal
• Name a kingdom other than animals that have similar homeotic genes

  Fungi
• Describe how transcription can be controlled in eukaryotes using the figure

  The hormone enters the cell and binds to the transcription factor

  the transcription factor is activated

  it binds to the promoter region

  so RNA polymerase is able to bind

  
• Describe how gene expression Can be regulated after transcription

  Removal of introns to produce mature mRNA

  Alternative splicing can produce different version of mRNA

  Binding of cAMP to alter shape of protein