Tag: CSIR NET Life Science Previous Year Questions and Solution on Morphogenesis and Organogenesis in Animals

What would happen as a result of a transplantation experiment in a chick embryo where the leg mesenchyme is placed directly beneath the wing apical ectodermal ridge (AER)? (1) Distal […]

Apical ectodermal ridge induction is essential tetrapod limb development. Which of the following is NOT essential for the formation of a functional limb? (1) Tbx genes and Wnt (2) Androsterone […]

Over-expression of a dominant negative FGF receptor during amphibian development would prevent formation of (1) trunk and tail (2) head and trunks. (3) trunk and fore limbs. (4) head and […]

In mice, the gene encoding Tbx5 is transcribed in limb fields of the forelimbs, while the genes encoding lslet1, Tbx4 and Pitx1 are expressed in presumptive hind limbs. Following statements […]

Which one of the following statements regarding limb development in mice is true? (1) The gene encoding Tbx5 is transcribed in the limb fields of the hindlimbs. (2) The gene […]

Anterior-posterior limb axis and dorsal ventral nerve plate is determined by (1) Bicoid (2) Sonic hedgehog (3) Pax3 (4) Cactus The patterning of the anterior-posterior (thumb-to-little finger) axis of the […]

The limb bud of a tetrapod is specified by (1) Hox genes only (2) retinoic acid only (3) both Hox genes and retinoic acid (4) fibroblast growth factor  The formation […]

In Amphibians, when due to some injury, the eye lens is damaged, the fully differentiated iris cells can regenerate the lens. It is achieved through the possible processes: A. Iris […]

Lens formation requires sequential events whereby the anterior neural plate signals the anterior ectoderm to promote secretion of Pax 6, which renders the anterior ectoderm more receptive to secretions from […]

Following are some statements given for vertebrate eye lens induction: A. Paired box6 (Pax6) is a transcription factor synthesized in specific region of head surface ectoderm. B. Pax6 is secreted […]