Final answer:
In the recombination synthesis-dependent strand-annealing model, Holliday Junction Resolution and Crossover Formation do not occur. Instead, it involves strand invasion and DNA synthesis without leading to crossovers.
Step-by-step explanation:
The two events that do not take place in the recombination synthesis-dependent strand-annealing (SDSA) model are A) Holliday Junction Resolution and D) Crossover Formation. The SDSA model involves strand invasion and DNA synthesis, but it differs from other recombination processes in that it avoids crossovers. This means that Holliday junctions, which are intermediate structures that can lead to crossover events, are not resolved in this model. Instead, the invading strand pairs with the homologous DNA to initiate repair, but then disassociates and anneals back to the original strand, without crossing over.
In the recombination synthesis-dependent strand-annealing model, the two events that do not take place are:
Crossover Formation: This event refers to the exchange of genetic material between nonsister chromatids and the formation of chiasmata. However, in this model, crossover formation does not occur.
Holliday Junction Resolution: Holliday junctions are structures that form during the process of genetic recombination. They are resolved through enzymatic activities, but in this model, the resolution of Holliday junctions does not occur.