Does meiosis occur when the immune system produces B and T cells?

Meiosis is the process by which germ-line cells (eggs and sperm) are produced. It is a specialized type of cell division that reduces the chromosome number by half, from diploid (2n) to haploid (n).

B and T cells are somatic cells, not germ-line cells, and are not produced through meiosis. Instead, they are produced through mitosis, the process by which somatic cells divide to produce two identical daughter cells.