W3L5 - DNA recombination

• In DNA recombination, the junction that forms is called a...

  1. Holiday Junction
  2. Holliday Junction
  3. Holy Day Junction
  4. Vacation Junction

  2
• In DNA recombination, which of the following are true:

  1. 2 strands of DNA are involved (i.e. one double strand)
  2. 4 strands of DNA are involved (i.e. 2x double strands)
  3. Genetic exchange (%cross-over%) takes place between a pair of homologous DNA sequences
  4. Heteroduplex regions (areas of mismatch) are formed
  5. Heteroduplex regions (areas of mismatch) are not formed
  6. Heteroduplex regions are repaired by mismatch repair.
  7. Horizontal cleavage of the junction will not produce recombinants.
  8. Horizontal cleavage of the junction will produce recombinants.

  2, 3, 4, 6, 7
• Fours strands of DNA are involved (i.e. 2x double strands) in recombination. During the process, regions of heteroduplex regions (areas of mismatch) are formed and these are later repaired by mismatch repair. The horizontal cleavage of the Holliday junction will not produce recombinants.
• Recombination occurs during...

  Meiosis