The spermatogonia produces the primary spermatocytes by           

The spermatogonia produces the primary spermatocytes by mitosis.

• Spermatogonia are the undifferentiated stem cells located in the testes. They divide by mitosis to produce more spermatogonia and also give rise to primary spermatocytes.
• The spermatogonia that undergo differentiation and enter meiosis I become primary spermatocytes. This is the key step where the chromosome number is reduced by half. Primary spermatocytes do not divide by mitosis but rather undergo meiosis I to produce secondary spermatocytes.
• After meiosis I, primary spermatocytes yield secondary spermatocytes. 
• Meiosis II results in the formation of haploid spermatids from secondary spermatocytes. 
• Spermatids undergo further differentiation and undergo a process called spermiogenesis to develop into fully mature, motile spermatozoa.