Spermatogonia are the earliest stage of male germ cells found in the testes. They are diploid cells, meaning they contain two sets of chromosomes. These cells undergo mitosis to produce more spermatogonia or differentiate into primary spermatocytes, which will eventually develop into sperm cells through a process called spermatogenesis. Located in the seminiferous tubules of the testes, spermatogonia play a crucial role in male fertility. They are responsible for the continuous production of sperm throughout a male's reproductive life. As they mature, they contribute to the formation of spermatozoa, the fully developed sperm cells that are essential for reproduction.