1 2 3 4

		enzymes that help it to fertilize the egg.
			b. Ovary
					i. Enter meiosis ii. Meiotic arrest iii. Oogenesis
								Figure 46.13
		In contrast, if the gonad develps into an ovary, the germ cells proliferate, then organize somatic cells around them to form follicles and enter meiosis. The germ cells arrest in meiotic prophase. Starting at puberty, individual oocytes complete meiosis I and are released from the follicle as a secondary oocyte. In most mammals, meiosis II is not completed until the oocyte is fertilized. So, it's aactually the somatic cells of the gonads that are responsible for sexual development. In lab this week, think about the similarities and differences between spermatogenesis and oogenesis in terms of their products, timetable and hormonal control as you are looking at the slides. II. Sex hormones & reproduction A. Production of secondary sex characteristics Sex hormones are produced by the gonads during fetal development and play a role in producing secondary sex characteristics. - Sertoli cells of the testis make anti-Müllerian hormone (AMH) which causes the regression of the Müllerian duct - Leydig cells of the testis make Testosterone which maintains the Wolfian duct which differentiates into the male accessory sex organs (seminal vesicle, epididymis and vas deferens) and external genetalia B. Adult reproduction Sex hormones also play a role in adult reproduction. 1. Human male46.14 a. Androgens required for sperm production b. LH stimulates androgen production c. Release of LH and FSH controlled by GnRH In adult human males, androgens are required for the production of sperm. Androgen production is stimulated by Lutenizing hormone (LH)which is