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In amphibian oocyte, the germplasm which gets segregated during cleavage to give rise to primordial germ cells (PGC’s) is normally (1) distributed evenly throughout the oocyte. (2) localized at animal […]

49. The dorsal-most vegetal cells of the amphibian embryo that is capable of inducing the organizer is called as Nieuwkoop centre and is marked by the presence of (1) Chordin                                                     […]

Which one of the following statements regarding amphibian development is correct? (1) The Nieuwkoop centre is formed on the dorsal side of the embryo due to accumulation of β-catenin which […]

  In the table below Column I lists terms related to development and Column II contains their descriptions not in a sequential manner. Select the option with all correct matches […]

46. The group of cells of amphibian blastula capable of inducing the organizer is called as (1) Hensen’s node                                                      (2) Nieuwkoop centre (3) Dorsal blastopore lip                                  (4) Hypoblast   The […]

45. Which protein secreted by the amphibian organizer induces neural tissue formation by inhibiting Bone Morphogenetic Protein? (1) β-catenin.                                                 (2) Noggin. (3) Dickkopf.                                                 (4) Dishevelled.   The protein secreted by […]

44. In case of is Xenopus levis which cells make up the Knewkoop center and Spemann’s organizer? (1) endodermal and mesodermal, respectively (2) mesodermal and endodermal, respectively (3) endodermal and […]

43. The blastopore region of amphibian embryo that secretes BMP inhibitors and dorsalizes the surrounding tissue is known as (1) Brachet’s cleft                                            (2) Nieuwkoop center (3) Hensen’s node                                           (4) Spemann’s […]

42. The initial dorsal-ventral axis in amphibian embryos is determined by (1) the point of sperm entry. (2) gravity. (3) the point of contact with the uterus. (4) genetic differences […]

The lateral separation of amphibian embryo at two celled stage will result in (1) Identical twins (2) Two embryos joined at belly region (3) Single embryo (4) Two embryos missing […]