When synapsis occurs a process called ______ ccues.

To find the answer to this question, you can research the process of synapsis and its associated events. Synapsis is the pairing of homologous chromosomes during meiosis. This pairing occurs during a specific phase called the pachytene stage of prophase I.

During synapsis, a structure called the synaptonemal complex forms between the homologous chromosomes. This complex holds the homologous chromosomes together and allows for the exchange of genetic material between them. This exchange is known as genetic recombination or crossing-over.

Since the original question is asking for a specific process that occurs during synapsis, the correct answer is "crossing-over." Crossing-over is the process where segments of DNA are swapped between homologous chromosomes. This genetic recombination results in the production of new combinations of alleles and increases genetic variation.

Therefore, the answer to the question is "crossing-over."