Several marine organism release their gametes into the environment, where sperm attraction and subsequent events lead to successful fertilization. With reference to sea urchins, which one of the following statements […]
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CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Understanding Cell Potency and Fate Specification in Embryonic Development
The fate of a cell or a tissue is specified when it is capable of differentiating autonomously on being placed in a neutral environment with respect to the developmental pathway. […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Understanding Fast and Slow Blocks to Polyspermy in Sea Urchin Fertilization
Polyspermy results when two or more sperms fertilize an egg. It is usually lethal since it results in blastomeres with different numbers and types of chromosomes. Many species therefore, have […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Defining Determination in Embryonic Development: Key Characteristics and Misconceptions
Given are certain facts which define ‘determination’ of a developing embryo. A. Cells have made a commitment to a differentiation program. B. A phase where specific biochemical actions occur in […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Factors Affecting Bindin-Egg Interaction in Sea Urchin Fertilization and Their Role in Preventing Fertilization
15. For successful fertilization in sea urchin, interaction between the surface of the egg and acrosomal proteins, specifically a 30.5 kDa protein called bindin, is necessary. The following factors could […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Cell Commitment in Development: Understanding Determination in Embryogenesis
During development, if a cell has committed to a particular fate, it is said to be (1) pluripotent (2) totipotent (3) determined (4) differentiated During the development of multicellular organisms, […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Events in Sea Urchin Fertilization: The Roles of Bindin, Acrosomal Reaction, and Cortical Granule Response
Following statements are made about fertilization occurring in sea urchins: A. Chemoattraction of the sperm to the egg is mediated by sperm activating peptides like bindin. B. Exocytosis of the […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Genetic Specificity of Interaction Demonstrated in Cross-Species Embryonic Transplantation
In a transplantation experiment, the area of presumptive ectoderm from an early frog gastrula was transplanted to a region of the newt gastrula destined to become parts of the mouth. […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Regional Specificity of Induction in Chick Feather Development
In chick, development of wing feather, thigh feather and claws depends on epithelial specificity conferred by induction from mesenchymal components from different sources of the dermins. This may be attributed […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Common Misconceptions in Sea Urchin Fertilization: Clarifying Calcium Signaling and Respiratory Burst
Consider the following events which occur during fertilization of sea urchin eggs. (A) Resact/Speract are peptides released from the egg jelly and help in sperm attraction. (B) Bindin, an acrosomal […]
