Final answer:
Synapsis is the process in which homologous chromatids become closely aligned during meiosis to form the synaptonemal complex. During synapsis, the genes on the chromatids of the homologous chromosomes are precisely aligned with each other. Synapsis also supports the exchange of chromosomal segments between non-sister homologous chromatids, which leads to genetic variation.
Step-by-step explanation:
The process in which homologous chromatids become closely aligned during meiosis to form a structure called the synaptonemal complex is called synapsis.
During synapsis, the genes on the chromatids of the homologous chromosomes are precisely aligned with each other. This process occurs during prophase I of meiosis.
Furthermore, synapsis also supports the exchange of chromosomal segments between non-sister homologous chromatids in a process called crossing over, which leads to genetic variation.