Oogenesis

Question 1

When does oogenesis begin?

Answer 1

Prenatally in the fetus. At birth, 1 oocytes are already present in the ovaries.

Question 2

Females begin with a fixed number of 1 oocytes that undergo meiosis. Then they form a follicle. What phase do they arrest in until puberty?

Answer 2

Prophase I

Question 3

How do the 1 oocytes come out of prophase I? What happens after?

Answer 3

Signals mediated by FSH during puberty. Continues through meiosis but arrests again in metaphase II

Question 4

When the gonadotropins FSH and LH are released from the anterior pituitary lobe, what happens?

Answer 4

Ovulation

Question 5

What happens during ovulation?

Answer 5

2 oocyte which was arrested in metaphase II is released from the follicle

Question 6

How does the 2 oocyte make it to the uterus?

Answer 6

Travel through the fallopian tube

Question 7

What happens if the 2 oocyte is fertilized?

Answer 7

Meiosis II is completed and a zygote is formed by the union of the spermatozoa and a mature ovum.

Question 8

What happens if the 2 oocyte is not fertilized?

Answer 8

The 2 oocyte disintegrates and is shed with the endometrial lining from the uterus during menstruation