The diagram is not provided with the question. However, the answer is based on the matter provided with the question and the best of knowledge.
Answer:
The correct answer is - crossing over.
Step-by-step explanation:
Crossing over occurs in prophase I or metaphase I of the meiosis type of cell division which takes place in the sex cells during sexual reproduction. During this process cells that have two autologous or correspondent chromosomes pair up together so the exchange of genetic material f non-sister chromatids can take place between correspondent chromosomes and result in a new allelic combination. The process is also known as synapsis as the two chromosomes pair up.