Inside the testes, stem cells become swimming sperm. They do it through meiosis, which cuts the chromosomes in half. That way egg + sperm make a full set. Step through it.
Spermatogonium
Spermatogenesisstem cell → sperm
The stages
📷 Reference image
A real labeled figure to compare with the interactive above.
Spermatogenesis — Lu Y, Aitken RJ, Lin M, CC BY 4.0 (via Wikimedia Commons)
