Species to expression of some of the pattern-forming genes in vertebrate limb bud: A. Lmx1b gene is expressed in dorsal mesenchyme B. Shh is expressed in the posterior region. C. […]
Tag: CSIR NET Life Science Previous Year Questions and Solution on Morphogenesis and Organogenesis in Animals
CSIR NET Life Science Previous Year Questions and Solution on Morphogenesis and Organogenesis in Animals
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CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Understanding Incorrect Statements in Tetrapod Limb Development: The Role of BMP in Cell Death and Hox Gene Patterns
Which one of the following statements is NOT correct regarding the tetrapod limb development? (1) As the limb grows outward, the stylopod forms first, then the zeugopod and the autopod […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
HOXD13 Mutation and Its Impact on Limb Development: Understanding Syndactyly and Digital Malformations
Homeobox transcription factor (Hox proteins), play important roles in specifying whether a particular mesenchymal cell will become stylopod, zeugopod or autopod. Based on the expression patterns of these genes, a […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
How Retinoic Acid Proximalizes Blastema and Activates Hox Genes to Induce Complete Limb Regeneration in Axolotls
When a wrist blastema from a recently cut Axolotl forelimb is placed on a host hindlimb cut at the mid thigh level, it will generate only a wrist. The host […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Role of BMP Signaling in Programmed Cell Death for Digit Separation During Tetrapod Limb Development
The programmed cell death that separates the digits during a tetrapod limb development is dependent on which one of the following signaling pathways? (1) BMP (2) FGF (3) Wnt (4) […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Mechanism of Limb Regeneration in Salamanders: Role of Blastema and Positional Specification
46. Which one of the following statements regarding limb regeneration in Salamander is correct? (1) A normal limb is regenerated after amputation, irrespective of whether the cut was made below […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Effect of Severing Nerve Supply on Newt Limb Regeneration: Importance of Nerves for Blastema Growth and Limb Outgrowth
How will the regeneration of a newt limb be affected if the nerve supply is severed before amputation? (1) Partial regeneration will occur where only the proximal structures will be […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Effect of Severe Nerve Severance on Newt Limb Regeneration: Role of Nerve Supply and Growth Factors
What would be the effect on newt limb regeneration, if more than 90% of the nerve supply is severed before amputation? (1) The apical ectodermal cap stimulates growth of the […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Key Aspects of Nerve Dependence and Pattern Regulation in Amphibian Limb Regeneration
Which of the following is true about amphibian limb regeneration? (A) It requires a minimum number of functional nerves. (B) The blastema of an amputated limb, if transplanted in the […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Dose-Dependent Effects of Retinoic Acid on Positional Identity During Limb Regeneration
Dose-dependence of retinoic acid treatment supports the notion that a gradient of retinoic acid can act as a morphogen along the proximo-distal axis in a developing limb. Following are certain […]
