Answer:
Meiosis
Step-by-step explanation:
Almost all the cells in an organism are produced by mitosis. Replication of chromosomes and organelles, followed by the splitting of a cell into 2 new cells. For example a human cell with 46 chromosomes would replicate these and there would then be 92 chromosomes, before it splits leaving two diploid cells. A diploid cell is a cell with 2 sets of chromosomes. Each set has 23 chromosomes.
However gametes are sex cells, also known as sperm and egg cells. These are formed by meiosis. In Meiosis, the chromosomes are replicated once, but the cell divides once into two, and the both cells divide again. This results in four cells, with each containing only 23 chromosomes, half the original amount. A cell with one set of chromosomes is known as a haploid cell.