Test One Review

Question 1

During oogenesis there are two meiosis arrests, the first occurs at what stage?

Answer 1

Diplotene stage

Question 2

Primordial germ cell migrate from where?

Answer 2

Yolk sac

Question 3

Which best describes oogonium in ovary during early fetal period?

Answer 3

Diploid oogonium with no follicles

Question 4

In meiosis paring of homologs occurs what stage of propahse?

Answer 4

zygotene

Question 5

What refers to a process by which a cell or embryo becomes restricted to a pathway?

Answer 5

Determination

Question 6

What is responsible for shutting down gap junctions after meiosis is resumed at ovulation?

Answer 6

LH

Question 7

Where does capacitation occur?

Answer 7

Isthmus of uterus

Question 8

During transport of egg through tract where is the most likely site of fertiliztion?

Answer 8

ampulla

Question 9

What cell type is outside blood testis barrier?

Answer 9

Spermatogonium

Question 10

Where does ejaculated sperm get its energy from?

Answer 10

Fructose in seminal vesicle fluid

Question 11

What cells in males convert testosterone to estrogen?

Answer 11

Sertoli cells

Question 12

Rapid transport of egg through isthmus of oviduct requires what hormone?

Answer 12

Progesterone

Question 13

Which cells are responsible for production of testosterone in testes?

Answer 13

Leydig cells

Question 14

What causes proliferation phase in endometrium?

Answer 14

Estradiol

Question 15

What components of graafian follicle form CL?

Answer 15

Granulosa and Thecal cells

Question 16

Inhibin released by granulosa cells during ovarian cycle inhibits secretion of gonadotropins especially FSH resuling in what?

Answer 16

Regression of CL

Question 17

During menstrual cycle a sharp spike in ___ is responsible for ovulation?

Answer 17

LH

Question 18

Based on knowledge of paralogous groups which gene would be expressed most anteriorly in embryo?

a. Hoxa13
b. Hoxc9
c. Hoxb1
d. Hoxb6

Answer 18

Hoxb1

Question 19

Principal inductor in primary neural induction is?

Answer 19

Notochordal processes

Question 20

Cells of what germ layer are not present in orppharyngeal membrane?

Answer 20

Mesoderm

Question 21

Brachyury a deficiency in in caudal tissues in the body is caused by what gene mutation?

Answer 21

Talus gene (T)

Question 22

Hypoblast of bilaminar early embryo gives rise to what tissues?

Answer 22

Extraembryonic endoderm only

(Epiblast gives rise to all embryonic germ layers and hypoblast is only concerned with extraembryonic

Question 23

Splitting of blastocyst during early development results in two complete but separate blastocyts encolsed within a single trophoblast. Most common form of twinning. What developmental characteristic is demonstrated?

Answer 23

Regulation

Question 24

Which of the following is thought to be one of the two signaling molecules that play a role in formathion of primitive streak?

Answer 24

TGF-B

Question 25

Is Pax a TF?

Answer 25

Yes

Question 26

Zinc fingers of Helix loop helix are members of what family?

Answer 26

TF

Question 27

What tissue from implanting i=embryo directly interfaces with endometrial CT?

Answer 27

syncytitrophoblast

Question 28

What prevents premature implantation of cleaving embryos?

Answer 28

ZP

Question 29

What is involved in lateral inhibition?

Answer 29

Delta notch

Question 30

What pathway does TGF-B use?

Answer 30

RTK

Question 31

Mutation in what receptor is basis for skin carcinomas?

Answer 31

Patched

Question 32

Transcription of what gene is required to permit cleavage to proceed to two cell stage?

Answer 32

4-Oct

Question 33

``` Which of following organizes border between dorsal and ventral thalamus? Prechordal plate Anterior neural ridge Isthimic organizer Zona limitans ```

Answer 33

Zona limitans

Question 34

Which gene classes are mRNA derived from maternal genome rather than embryonic genome?

Answer 34

Egg polarity genes

Question 35

Where does fertiliztion occur?

Answer 35

ampulla

Question 36

Most transcription via embryonic genomes as opposed to maternal genome occurs as early s what stage?

Answer 36

4 cell stage

Question 37

Late primitive streak stage which signal released from primitive streak activates hox genes?

Answer 37

FGF