In the Holliday model describing recombination
A)homologous sequences line up.
B)strands of DNA are nicked.
C)DNA strands associate with the homologous strand ("strand invasion").
D)strands rotate then are cleaved at the crossover point.
E)All of the above.

Question

Quizplus · Accepted Answer

All of the steps mentioned in choices A to D are included in the Holliday model of recombination. Homologous sequences first line up, followed by DNA strands being nicked, and then the DNA strands associate with the homologous strand in a process called "strand invasion." The strands then rotate and are cleaved at the crossover point, leading to the exchange of genetic material.

In the Holliday Model Describing Recombination