If you have a defect that blocks the release of gonadotropin releasing hormone (

Question

If you have a defect that blocks the release of gonadotropin releasing hormone (GnRH) from the pituitary, which of the following statements about folliculogenesis would be true?

   A.   Folliculogenesis would occur normally

   B.   Estrogen would inhibit follicle stimulating hormone (FSH) from the hypothalamus .

   C.     A lack of GnRH would inhibit folliculogenesis.

   D.   The lack of GnRH would block only the luteinizing hormone (LH) surge.

You have made a transgene that expresses green fluorescent protein (GFP) in spermatogonia only. If you are examining a transverse section of a seminiferous tubule where would you expect to find GFP positive (GFP+) cells?

A.   In the epididymis.

B.   In the middle of the seminiferous tubule wall.

C.   In the lumen in the center of the seminiferous tubule.

D.   Along the basement membrane of the seminiferous tubule.

Synapsis only occurs during meiosis, which of the following accurately describe this event?

A.   Formation of a bivalent on specialized protein structure

B.   Homologous recombination at chiasmata

C.   Breakdown of the nuclear membrane

D.   Nondisjunction of sister chromatids

Explanation / Answer

Ans.) “C”

(Lack of GnRH would inhibit folliculogenesis. Defect in release of gonadotropins releasing harmone directly affects the release of LH (luteinizing hormone) and FSH (follicle-stimulating hormone). The luteinizing hormone is necessary for the initiation of folliculogenesis.)

Ans.)   “D”

(Spermatogonia are found in the basal membrane of the seminiferous tubule.)

Ans.) “B”

(During synopsis the two homologous chromosome pair up at chiasmata).

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