Final answer:
Hormones produced by the hypothalamus and pituitary gland stimulate ovarian follicle development and estrogen production in females, as well as spermatogenesis in males.
Step-by-step explanation:
The development of ovarian follicles and estrogen production in ovaries, as well as spermatogenesis in testes, are stimulated by hormones produced by the hypothalamus and pituitary gland. In females, follicle-stimulating hormone (FSH) stimulates the growth and maturation of follicles in the ovaries, which then release estrogen. Luteinizing hormone (LH) triggers ovulation and the production of estrogen and progesterone in the ovaries. In males, LH stimulates the testes to produce testosterone, while FSH stimulates spermatogenesis.