43. The blastopore region of amphibian embryo that secretes BMP inhibitors and dorsalizes the surrounding tissue is known as (1) Brachet’s cleft (2) Nieuwkoop center (3) Hensen’s node (4) Spemann’s […]
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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 Basic Concepts of Development
How the Initial Dorsal-Ventral Axis Is Determined in Amphibian Embryos: The Crucial Role of Sperm Entry
42. The initial dorsal-ventral axis in amphibian embryos is determined by (1) the point of sperm entry. (2) gravity. (3) the point of contact with the uterus. (4) genetic differences […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
What Happens When an Amphibian Embryo is Laterally Separated at the Two-Celled Stage? Identical Twins Explainedv
The lateral separation of amphibian embryo at two celled stage will result in (1) Identical twins (2) Two embryos joined at belly region (3) Single embryo (4) Two embryos missing […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Trans-determination in Drosophila Imaginal Discs: Understanding Developmental Plasticity and Cell Fate Switching
The change in the state of specification of imaginal disc of Drosophila to that of a different disc type is known as (1) Trans-determination (2) trans-differentiation (3) transformation (4) transduction […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Categorization and Matching of Developmental Genes in Drosophila Embryogenesis
The table given below provides categories and names of genes involved n Drosophila developmentWhich one of the following options is a correct match between the categories and gene names? (1) […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Ultrabithorax Gene Deletion Phenotype in Drosophila: A Detailed Analysis
What is the observed phenotype when the ultrabithorax gene is deleted in Drosophila? (1) The third thoracic segment is transformed into another second thoracic segment resulting in a fly with […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Function and Mutation Effects of the Antennapedia Gene in Drosophila Development
Antennapedia complex in Drosophila contains five genes, lab, pb, dfd, scr and Antp and they express in parasegments 1 to 5, respectively in a non-overlapping manner. In the larva or […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
The Role of the Dorsal Lip as the Primary Organizer in Xenopus Embryonic Development
40. The grafting of the dorsal lip of the blastopore from an early Xenopus gastrula onto the ventral side of an early embryo will result in two complete embryos. Thus […]
CSIR NET Life Science Previous Year Questions and Solution on Development Biology
Molecular Basis of Wing-to-Haltere Transformations in Drosophila: The Role of Ultrabithorax and Homeotic Genes
A mutant was experimentally generated which wings had reduced to halter like structure. The following statements are put forward regarding this phenotype: A. ultrabithorax gene ectopically expressed in second thoracic […]
CSIR NET Life Science Previous Year Questions and Solution on Basic Concepts of Development
Understanding the Equivalent of the Amphibian Dorsal Lip in Chick Embryos: Hensen’s Node
Dorsal lip of amphibian is equivalent to chick’s (1) Hensen’s node (2) Primitive grove (3) Animal pole (4) Vegetal pole Introduction Embryonic development in vertebrates showcases conserved organizational centers critical […]
