Test One Review Flashcards
During oogenesis there are two meiosis arrests, the first occurs at what stage?
Diplotene stage
Primordial germ cell migrate from where?
Yolk sac
Which best describes oogonium in ovary during early fetal period?
Diploid oogonium with no follicles
In meiosis paring of homologs occurs what stage of propahse?
zygotene
What refers to a process by which a cell or embryo becomes restricted to a pathway?
Determination
What is responsible for shutting down gap junctions after meiosis is resumed at ovulation?
LH
Where does capacitation occur?
Isthmus of uterus
During transport of egg through tract where is the most likely site of fertiliztion?
ampulla
What cell type is outside blood testis barrier?
Spermatogonium
Where does ejaculated sperm get its energy from?
Fructose in seminal vesicle fluid
What cells in males convert testosterone to estrogen?
Sertoli cells
Rapid transport of egg through isthmus of oviduct requires what hormone?
Progesterone
Which cells are responsible for production of testosterone in testes?
Leydig cells
What causes proliferation phase in endometrium?
Estradiol
What components of graafian follicle form CL?
Granulosa and Thecal cells
Inhibin released by granulosa cells during ovarian cycle inhibits secretion of gonadotropins especially FSH resuling in what?
Regression of CL
During menstrual cycle a sharp spike in ___ is responsible for ovulation?
LH
Based on knowledge of paralogous groups which gene would be expressed most anteriorly in embryo?
a. Hoxa13
b. Hoxc9
c. Hoxb1
d. Hoxb6
Hoxb1
Principal inductor in primary neural induction is?
Notochordal processes
Cells of what germ layer are not present in orppharyngeal membrane?
Mesoderm
Brachyury a deficiency in in caudal tissues in the body is caused by what gene mutation?
Talus gene (T)
Hypoblast of bilaminar early embryo gives rise to what tissues?
Extraembryonic endoderm only
(Epiblast gives rise to all embryonic germ layers and hypoblast is only concerned with extraembryonic
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?
Regulation
Which of the following is thought to be one of the two signaling molecules that play a role in formathion of primitive streak?
TGF-B
Is Pax a TF?
Yes
Zinc fingers of Helix loop helix are members of what family?
TF
What tissue from implanting i=embryo directly interfaces with endometrial CT?
syncytitrophoblast
What prevents premature implantation of cleaving embryos?
ZP
What is involved in lateral inhibition?
Delta notch
What pathway does TGF-B use?
RTK
Mutation in what receptor is basis for skin carcinomas?
Patched
Transcription of what gene is required to permit cleavage to proceed to two cell stage?
4-Oct
Which of following organizes border between dorsal and ventral thalamus?
Prechordal plate
Anterior neural ridge
Isthimic organizer
Zona limitansZona limitans
Which gene classes are mRNA derived from maternal genome rather than embryonic genome?
Egg polarity genes
Where does fertiliztion occur?
ampulla
Most transcription via embryonic genomes as opposed to maternal genome occurs as early s what stage?
4 cell stage
Late primitive streak stage which signal released from primitive streak activates hox genes?
FGF
