Oogenesis + Ovulation

Question 1

oogenesis

Answer 1

• production of immature eggs in ovaries of fetus

- complete by time of birth

Question 2

female reproductive lifetime

Answer 2

• describes years when mature eggs are released

- from puberty to menopause

Question 3

menopause

Answer 3

end of reproductive lifetime (at ~50 yrs old)

Question 4

oogonia

Answer 4

female egg stem cells

Question 5

process of oogenesis (2 steps)

Answer 5

1. oogonia undergo mitotic division –> 2 primary oocytes (daughter cells)
2. primary follicles cover the primary oocytes

Question 6

egg maturation overview

Answer 6

• begins at puberty
• a few follicles mature each month
• caused by release of follicle stimulating hormone (FSH) by ant pit. gland

Question 7

egg maturation process

Answer 7

primary oocyte in follicle undergoes meiotic division, producing secondary oocyte + polar body

Question 8

polar body

Answer 8

contains same chromosomes as secondary oocyte but donates its cytoplasm to oocyte (important in case oocyte becomes fertilized)

Question 9

secondary oocyte

Answer 9

• mature egg that is released during ovulation

- if not fertilized, leaves body via menstruation

Question 10

if secondary oocyte unites with sperm

Answer 10

1. the now fertilized egg undergoes another meiotic division

2. this produces an ovum (which forms zygote w/sperm) + a second polar body

Question 11

zygote

Answer 11

• fertilized egg

- made up of ovum (23 chromosomes) and sperm (23 chromosomes)

Question 12

ovarian cycle

Answer 12

~ every 28 days ovulation occurs

Question 13

ovulation

Answer 13

• release of mature egg (secondary oocyte) from ovary

- triggered by release of luteinizing hormone from ant. pit gland

Question 14

corpus luteum

Answer 14

• what ovarian follicle turns into once its egg has been released
• helps maintain pregnancy if egg becomes fertilized (disintegrates if not)