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Embryology KCU > Test One Review > Flashcards

Test One Review Flashcards

1
Q

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

A

Diplotene stage

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2
Q

Primordial germ cell migrate from where?

A

Yolk sac

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3
Q

Which best describes oogonium in ovary during early fetal period?

A

Diploid oogonium with no follicles

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4
Q

In meiosis paring of homologs occurs what stage of propahse?

A

zygotene

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5
Q

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

A

Determination

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6
Q

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

A

LH

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7
Q

Where does capacitation occur?

A

Isthmus of uterus

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8
Q

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

A

ampulla

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9
Q

What cell type is outside blood testis barrier?

A

Spermatogonium

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10
Q

Where does ejaculated sperm get its energy from?

A

Fructose in seminal vesicle fluid

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11
Q

What cells in males convert testosterone to estrogen?

A

Sertoli cells

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12
Q

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

A

Progesterone

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13
Q

Which cells are responsible for production of testosterone in testes?

A

Leydig cells

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14
Q

What causes proliferation phase in endometrium?

A

Estradiol

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15
Q

What components of graafian follicle form CL?

A

Granulosa and Thecal cells

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16
Q

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

A

Regression of CL

17
Q

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

A

LH

18
Q

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

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

A

Hoxb1

19
Q

Principal inductor in primary neural induction is?

A

Notochordal processes

20
Q

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

A

Mesoderm

21
Q

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

A

Talus gene (T)

22
Q

Hypoblast of bilaminar early embryo gives rise to what tissues?

A

Extraembryonic endoderm only

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

23
Q

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?

A

Regulation

24
Q

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

A

TGF-B

25
Q

Is Pax a TF?

A

Yes

26
Q

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

A

TF

27
Q

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

A

syncytitrophoblast

28
Q

What prevents premature implantation of cleaving embryos?

A

ZP

29
Q

What is involved in lateral inhibition?

A

Delta notch

30
Q

What pathway does TGF-B use?

A

RTK

31
Q

Mutation in what receptor is basis for skin carcinomas?

A

Patched

32
Q

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

A

4-Oct

33
Q 
Which of following organizes border between dorsal and ventral thalamus?
   Prechordal plate
    Anterior neural ridge
   Isthimic organizer
   Zona limitans
A

Zona limitans

34
Q

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

A

Egg polarity genes

35
Q

Where does fertiliztion occur?

A

ampulla

36
Q

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

A

4 cell stage

37
Q

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

A

FGF

Embryology KCU (21 decks)

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