Write the steps involved in molecular mechanism of DNA recombination.

Explanation

1. Homologous DNA molecules are paired side by side with their duplicated copies of DNAs
2. One strand of both DNAs cut in one place by the enzyne endonuclease.
3. The cut strands cross and join the homologous strands forming the Holliday structure of Holliday junction .
The Holliday junction migrates away from the original site, a process migrating, as a result heteroduplex region is formed.
5. DNA strands may cut along through the vertical (V) line or horizontal (H) line.
6. The vertical cut will result in heteroduplexes with recombinants .
7. The horizontal will result in heteroduplex with non recombinants.