What process in cells undergoing meiosis increases genetic diversity

Crossing over

Explanation:

Meiosis a type of cell division which produce daughter cells with different genetic material compared to parent cell.

This difference in the genetic material in the daughter cells is the result of a phenomenon called recombination which takes place during the pachytene of prophase I.

The synaptonemal complex is formed during pachytene which allows the crossing over or recombination or exchange between the homologous chromosomes. This process introduces genetic variation in the population.

Thus, Crossing over is the correct answer.