Tag: Early Development in Animals

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 […]

40. The grafting of the dorsal lip of the blastopore from an early Xenopus gastrula onto the ventral side of an early embryo will result in two complete embryos. Thus […]

Dorsal lip of amphibian is equivalent to chick’s (1) Hensen’s node (2) Primitive grove (3) Animal pole (4) Vegetal pole Introduction Embryonic development in vertebrates showcases conserved organizational centers critical […]

38. The specification of sea urchin micromeres involves the activation of a repressor protein Pmar1, which represses the expression of hesC, which also encodes a repressor protein. One of the […]

37. In sea urchins, a group of cells at the vegetal pole become specified as the large micromere cells. These cells are determined to become skeletogenic mesenchyme cells that will […]