The cell process used to make gametes (sperm and egg cells) is called meiosis.

Here's why:

* Gametes are haploid: They have half the number of chromosomes as a regular body cell.

* Meiosis is a reduction division: It takes a diploid cell (with two sets of chromosomes) and produces four haploid cells.

* Genetic diversity: Meiosis shuffles the genetic material, ensuring that each gamete is unique and contributes to genetic diversity in offspring.

Let me know if you'd like more detail about the steps involved in meiosis!