Which of the following statements is true about dorso- ventral patterning of drosophila embryo? (A) This is dictated by the location of the nurse cells (B) Dorsal is the default […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES (62)
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Impact of Homeotic Gene Mutations on Drosophila Embryonic Development
During embryogenesis, a Drosophila embryo with a mutation in a homeotic gene shows (1) changed polarity of each segment. (2) defects in dorso-ventral polarity. (3) deletion of several segments in […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Gene Regulatory Network and Delta Expression in Sea Urchin Micromere Specification
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Role of Torpedo Receptor and Gurken Signaling in Dorsal-Ventral Axis Formation in Drosophila
Torpedo, is known to serve as a receptor for Gurken. Deficiencies of the torpedo gene in Drosophila cause ventralization of the embryo. In an experiment, the germ cell precursors from […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Gene Regulatory Network Controlling Micromere Specification in Sea Urchin Embryos
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Role of Torpedo Receptor and Gurken Protein Interactions in Dorsal-Ventral Axis Formation in Drosophila Germ Line Chimera Experiments
Torpedo is a trans-membrane receptor on follicle cells that binds with Gurken protein located in the presumptive dorsal surface of the oocytes and inhibits a cascade leading to nuclear localization […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Understanding the Role of Disheveled and β-Catenin in Early Sea Urchin Embryonic Development
Given below are few statements regarding the role of Disheveled (Dsh) and β-catenin (β-cat) in the development of sea urchin. A. Dsh is localized in the vegetal cortex of the […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Role of Dorsal Protein in Establishing Dorsal-Ventral Polarity in Drosophila Embryos
The Dorsal protein is involved in generating the dorsal-ventral (DV) polarity in Drosophila. The following statements were made regarding the activity of the Dorsal protein in establishing the DV polarity. […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Autonomous and Conditional Cell Fate Specification in Sea Urchin Embryos
Following statements with respect to development in sea urchin were put forth: A. The cell fates are determined both by autonomous and conditional modes of specification. B. Large micromeres are […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Molecular Events During Dorsal-Ventral Axis Specification in Gurken-Deficient Drosophila Embryos
Following are the events that might take place during demo-ventral axis specification in early embryonic development of Drosophila: A. ‘Torpedo’ receptor activation B. ‘Pipe’ synthesis C. A cascade of protease […]
