Function of gonads and sex accessory organs. Hormonal control of gonadal function. Effects of sex hormones on other body functions. Gonads are not essential to life. Important for preservation of species.
Reproductive success is a major determinant of the course of evolution.
Population control has become a major world issue. Development and Differentiation of Reproductive System. Birds and reptiles. B. Gonadal sex . Determinant of gonadal sex is Y-chromosome .