The anterior-posterior compartment of each segment of Drosophila is defined by wingless and engrailed genes. The following statements are given towards explaining their regulation: A. Wingless is a secretory factor […]
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CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Effects of Wingless RNAi Expression in Developing Drosophila Embryos: Implications for Segmental Patterning
What will happen if wingless RNAi is expressed in wingless expressing cells from the stage when this gene initiates its expression in a developing Drosophila embryo? A. The enhanced expression […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Autonomous and Conditional Specification in Tunicate Embryonic Development
When the 4 blastomere pairs of the 8-cell stage tunicate embryo are dissociated, each forms most of the structures it would have formed had it remained in the embryo. However, […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Maintenance of Engrailed and Wingless Expression in Drosophila: Key Molecular Mechanisms
The continued expression of engrailed and wingless is maintained by interactions between the Engrailed- and Wingless-expressing cells. The following statements are given towards the initiation of the cascade of events […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Understanding Sea Urchin Embryo Development: Cellular Potency and Axis Formation
31. Which one of the following about development of sea urchin embryos is TRUE? (1) Each blastomere of a 4-cell stage possesses a portion of the original animal-vegetal axis and […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Understanding Anterior and Posterior Compartment Development in Drosophila Segments
The following are statements regarding the development and maintenance of anterior and posterior compartments in each segment of Drosophila: A. Expression of wingless and engrailed is activated by pair-rule genes […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Driesch’s Pressure Plate Experiment Reveals Equipotentiality and Potency in Sea Urchin Embryos
Dreisch performed the “pressure plate experiment” to alter the distribution of nuclei in a 8-cell sea urchin embryo. He obtained normal larvae from these embryos. Following possible conclusions could be […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Driesch’s Pressure Plate Experiment: Insights into Regulative Development in Sea Urchins
29. Driesch performed famous ‘pressure plate” experiments involving intricate recombination with 8- celled Sea urchin embryo. This procedure reshuffled the nuclei that normally would have been in the region destined […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Understanding Engrailed Expression in Drosophila melanogaster: Defining Posterior Compartment of Each Segment
Engrailed expression in Drosophila melenogaster defines (1) anterior margin of the segment. (2) anterior compartment of each segment. (3) posterior margin of each para-segment. (4) posterior compartment of each segment […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Mammalian Extraembryonic Structures: Origins and Functional Roles
28. With respect to the extra embryonic structures formed in the mammals, the possible functional attributes have been designated: A. Allantoin stores urinary waste and helps mediate gas exchange. It […]
