Gametes are formed and the chromosome number is reduced in this type of cell division

Answer: meiosis

Meiosis is a type of cell division in which gametes are formed and number of chromosome is reduce i. e. from double to half.

Explanation:

Meiosis cell division only occurs in sex cells of male and female. In meiosis, the parent cell that is diploid i. e. double number of chromosomes, is divided into four daughter cells having half number of chromosome each i. e. haploid or monoploid. These cells are responsible for the variation that occurs in the living organisms.