Gametogenesis

Question 1

development of female gamete

Answer 1

primordial germ cells migrate into ovary and undergo mitosis –> oogonium + mitosis –> primary oocyte

Question 2

primary oocytes reside in _

Answer 2

follicles

Question 3

primary oocytes are suspended in _

Answer 3

prophase, unless chosen for ovulation

Question 4

primary oocyte chosen for ovulation

Answer 4

goes through first meiotic division –> secondary oocyte –> secondary oocyte will begin second division and be arrested at metaphase until fertilization

Question 5

primordial follicle

Answer 5

ONE primary oocyte + surrounding epithelial cells

Question 6

primordial follicles give rise to _

Answer 6

primary follicles –> secrete zone pellucida

Question 7

antrium

Answer 7

fluid filled space that acts to expand diameter of follicle –> secondary follicle

Question 8

formation of male spermatid

Answer 8

-spermatogonium undergo mitosis to become spermatocyte –> spermatocyte under goes two rounds of meiosis –> secondary spermatocyte –> spermatid

Question 9

males produce spermatogonium _

Answer 9

throughout lifetime

Question 10

spermatid to sperm

Answer 10

nucleus condenses to heterochromatin, centriole gives rise to microtubule tail, RER and golgi form the acrosome, mitochondria are concentrated in the middle

Question 11

formation of corpus luteum

Answer 11

egg + mass of cumulus cells are ejected from the follicle for ovulation –> remnants of this collapsed follicle differentiate into corpus luteum

Question 12

corpus luteum

Answer 12

produces estrogen + progesterone for the secretory stage

Question 13

FSH

Answer 13

causes primary follicles to become secondary follicles

Question 14

How many secondary follicles does FSH induce?

Answer 14

around 20-30 so some can stay back to secrete estrogen for development of endometriumm

Question 15

How many secondary follicles does FSH induce?

Answer 15

around 20-30 so some can stay back to secrete estrogen for development of endometrium

Question 16

proliferative phase

Answer 16

when layers of endometrium are built each montht

Question 17

progesterone from corpus luteum

Answer 17

cuts off LH production

Question 18

LH

Answer 18

aids in late stages of maturation of follicles; LH surge causes ovulation and also forms corpus luteum

Question 19

menstral phase

Answer 19

happens when corpus luteum degenerates, resulting in plummet of estrogen and progesterone resulting in degeneration of endometrial layer

Question 20

progesterone

Answer 20

maintains endometrium to support implantation

Question 21

changes before/during fertilization

Answer 21

as sperm approaches egg, there is an acrosome reaction –> enzymes in acrosome help sperm get through zona pellucida –> penetration –> when sperm makes contact, changes occur in zona pellucida to inhibit any other sperm from also fertilizing the egg –> attachment stimulates second meiotic division

Question 22

implanting blastocyst secretes _

Answer 22

hCG for maintenance of corpus luteum (so it can produce progesterone and estrogen to sustain functional layer of endometrium)

Question 23

implantation at _

Answer 23

day 6