1. Spermatogenesis and Oogenesis
Pgs (Campbell)

3. Spermatogenesis Production of sperm Occurs in the testes
Continuous and prolific
Each ejaculation contains ~ million sperm
Occurs in the testes
Seminiferous tubules

4. What happens is …
Spermatogonia (stem cells that give rise to sperm) are located at the periphery of each seminiferous tubule
Spermatogonia are diploid
Developing sperm move toward the central opening (lumen) of the tubule as they undergo meiosis and differentiation
4 cells result
Develop into mature sperm
Haploid

5. Pg. 985 Campbell
Page 985 Campbell

6. The structure of sperm
Campbell

7. Oogenesis The development of ova
Mature, unfertilized eggs cells
Happens in the ovary
Oogonia (stem cells that give rise to ova)
Multiply and begin meiosis
STOPS at prophase 1
At this phase, the cells are called primary oocytes
Remain in this phase until the onset of puberty, when they are activated by hormones
Activated by LH and FSH

8. What happens next ...
Beginning at puberty, FSH periodically stimulates a follicle to grow and induces its primary oocyte to complete meiosis 1 and start meiosis 2
Meiosis then STOPS again
The secondary oocyte, released during ovulation, does not continue meiosis right away
Penetration of the egg cell by sperm triggers the completion of meiosis
Then meiosis is complete
LH stimulates the completion of meiosis

9. Campbell
Growing follicle

10. Major difference #1
1. unevenness in the mitotic division/cytokinesis of oogenesis
Almost all the cytoplasm  1 daughter cell (secondary oocyte)
3 polar bodies which degenerate
Spermatogenesis = four mature sperm

11. Major difference #2
The cells that produce sperm continue to divide by mitosis throughout life (males)
Not the case for women
*born with all the primary oocytes

12. Major difference #3 Oogenesis has long resting periods
Sperm is produced in an uninterrupted sequence

14. Exit Slip
On the slip of paper, write a proper heading and title it Exit Slip 4/14/09
Answer the following questions in complete sentences:
1. When (during the menstrual cycle) does the production of the hormones FSH and LH peak?
2. Arrange the following organs in the correct sequence for the travel of sperm: epididymis, testis, urethra, vas deferenes
3. List one function/role for the following hormones:
Testosterone
Estrogen
FSH