Oral contraceptives contain synthetic steroids that inhibit release of GnRH and then of FSH and LH, so no egg is released. However, the estrogen and progesterone in the pill supports the uterine cycle; suspension of the pill each month permits menstruation. Two new hypothalamic peptides work in opposition to control : Gonadotropin-inhibiting hormone (GnIH) inhibits [...]

Male Reproductive System Testes: tightly coiled semineferous tubules (sperm produced here). epididymis outside testes where sperm mature (where sperm get mobile). The epididymis is connected to the urethra via the vas deferens. Acrosome, DNA, mitochondria, tail. Leydig cells between semineferous tubules produce testosterone. Making sperm. Spermatogonium. In the presence of testosterone and at slightly lower [...]

Males produce the smaller gamete. Females produce the larger gamete. Hermaphrodites produce both male and female gametes.

Gametogenesis is the development of germ cells into gametes. Gametes are large nonmotile oocytes in females, and small motile sperm in males. Gametogenesis occurs in the gonads: ovaries in females and testes in males. The two main differences between oogenesis and spermatogenesis: prophase arrest; and unequal division. Step Start Result Overview Germ Cell Germ Cell [...]

Sources: Dr. Walker Requires joining of two haploid cells (gametes) to form a diploid individual. Gametes are produced by gametogenesis, a process involving meiotic cell divisions. Two meiotic events contribute to genetic diversity: crossing over between homologous xsms and independent assortment of xsms. Sexual reproduction itself contributes much genetic diversity, because the two parents have [...]