Answer: begins during adolescence
Step-by-step explanation:
During puberty the testosterone hormone is released by the testes in males which initiates the process of spermatogenesis in males. The spermatogenesis is the process by which the maturation of the sperm cells in the testes takes place. The testes comprises of numerous thin, coiled tubules called as the seminiferous tubules. The each spermatozoa consist of head, middle body and short tail to swim and fertilize the female ovum.