Introns/Exons

• What are introns and exons?

  Introns - non coding section of DNA

  Exons - coding sections of DNA
• What are STRs?

  Repeating bases on a DNA strand

  No. of repeats in unique to every individual
• What happens in post-transcription modification?

  (Basically yk in transcription, after the whole shabang, this stuff is after mRNA released from DNA, and before it leaves nucleus to bind to ribosome)

  • In pre-mRNA
  • Introns are spliced out by spliceosomes (enzymes)
  • Remaining exons connect together in splicing process
  • NOW UVE GOT POST-MRNA
• How can one gene give rise to more than one protein?

  • Post-transcription modification of mRNA
  • Can give rise to different forms of mRNA (diff arrangement of exons)
  • Can be translated into different proteins

  ALSO

  • Mutations can give rise to different genes
  • Different forms of mRNA
  • Different proteins