Define spermatogensis

Spermatogenesis is the process by which haploid sperm cells are produced from diploid cells. During spermatogenesis, diploid cells called spermatogonia undergo mitosis to produce two daughter cells, one of which remains a spermatogonium and the other differentiates into a haploid cell called a primary spermatocyte. The primary spermatocyte undergoes meiosis I and II to produce four haploid cells called spermatids, which then mature into sperm cells.