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Flashcards in Gametogenesis Deck (22):
1

where do primordial germ cells migrate from

the wall of the yolk sac

2

where does genetic variation come from in meiosis

- crossing over at chiasmata in prophase 1
- independent assortment of bivalents and chromatids in metaphase

3

where does spermatogenesis occur

in the spaces between Sertoli cells in the seminiferous tubules

4

what is spermiogenesis

the differentiation of the 4 spermatids into spermatozoa

5

what is spermiation

the release of sperm into the seminiferous tubule lumen

6

when sperm are first produced they are non-motile, so how do they move to the epididymus

through peristalic contractions and due to secretions of the Sertoli cells

7

what is the spermatogenic cycle

the time taken to reach the same stage in spermatogenesis at a particular part of the tubule

8

what is the spermatogenic wave

the distance between 2 areas of the seminiferous tubules which are at the same stage of spermatogenesis

9

why is sperm capacitation

where sperm lose the glycoproteins and cholesterol surrounding the membrane around the head

10

why does sperm capacitation occur

to allow the sperm to penetrate the zone pellucida

11

what is a primordial follicle

when the primary oocyte is surrounded in a single layer of flat cells called follicular cells

12

what are the 3 stages of development that the primordial follicle undergoes

1. preantral
2. antral
3. preovulatory

13

what happens in the preantral development stage

the surrounding follicular cells change to a strafed cuboidal surrounding called granulose cells

14

what do granulose cells do

secrete a glycoprotein covering to produce the bona pellucida

15

what happens in the antral stage of development

fluid filled spaces around the granulose cells form and fuse to form the Antrum

16

what happens in the preovulatory stage of development

the cell finished meiosis 1 and enters meiosis 2, arresting at metaphase.

17

when is meiosis completed in oogenesis

following fertilisation

18

what hormone drive the preovulatory stage

LH

19

wat is the corpus luteum

the remaining granulose and interna theca cells after the egg has left the ovary

20

what does the corpus luteum secrete

oestrogen and progestoerone

21

what happens to the corpus luteum is fertilisation doesn't occur

if will die and form scar tissue (corpus albicans)

22

what happens to the corpus luteum if fertilisation does occur

it will remain and produce progesterone