CSIR NET Life Science Free Test on Drosophila Development Archives - CSIR NET LIFE SCIENCE COACHING | NTA NET LIFE SCIENCE

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

Trans-determination in Drosophila Imaginal Discs: Understanding Developmental Plasticity and Cell Fate Switching

admin
November 8, 2025
13 Comments

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 […]

write a seo friendly article with appropriate title,slug and meta description write in thousand words without giving reference .follow this command in every questions

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Categorization and Matching of Developmental Genes in Drosophila Embryogenesis

admin
November 8, 2025
17 Comments

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) […]

31. 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 four wings. (2) Since it specifics the second thoracic segment, instead of antenna leg grows out of the head socket. (3) Since it specifies the third thoracic segment, a fly with two pairs of halters develop. (4) Since this gene fails to be expressed in the second thoracic segment, the antennae sprout in the leg position.

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Ultrabithorax Gene Deletion Phenotype in Drosophila: A Detailed Analysis

admin
November 8, 2025
15 Comments

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 […]

30. 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 in later stages of development, the region of Antp (Antennapedia) expression corresponds to a part of second thoracic segment. A mutation in Antp is known to cause transformation of antenna to leg-like structures. Below are certain statements made in respect to the functions of Antennapedia: A. In the above described Antp mutation, the gene ectopically expresses in the head region B. One of the functions of Antp is torepress genes that induce antenna development C. Antp expresses in thorax and forms a concentration gradient in the posterior-anterior direction, thus affecting head development D. A homozygous recessive mutation of Antp is expected to transform the leg to antenna in the second thoracic segment. Which combination of the above statements correctly describes the function of Antennapedia? (1) A, Band C (2) B and C (3) C and D (4) A, B and D

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Function and Mutation Effects of the Antennapedia Gene in Drosophila Development

admin
November 8, 2025
8 Comments

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 […]

29. 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 segment B. antennapedia gene ectopically expressed in second thoracic segment C. A homeotic mutation, D. A mutation in gap gene The following combination of statements will be most appropriate explaining the molecular basis of mutant phenotype: (1) A and B (2) B and C (3) C and D (4) A and C

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

admin
November 8, 2025
10 Comments

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 […]

28. 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 fate (C) The whole process is regulated by preventing the entry of a transcription factor to the nucleus of dorsal cells (D) Homeobox containing genes play a critical role in this process. (1) (A), (B) and (C) (2) (A),(B), (C) and (D) (3) (A) and (D) (4) (B) and (C)

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Understanding Dorsal-Ventral Patterning in Drosophila Embryos: Key Molecular Mechanisms

admin
November 8, 2025
10 Comments

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 […]

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 a row. (4) replacement of one body part by another body part

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Impact of Homeotic Gene Mutations on Drosophila Embryonic Development

admin
November 8, 2025
15 Comments

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 […]

26. 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 a wild type embryo were transplanted into embryos whose mother carried the torpedo mutation. Also, the reverse experiment, i.e., transplantation of germ cell precursors from torpedo mutants into wild type embryos was done. The torpedo deficient germ cells developed in a wild type female showed normal dorso-ventral axis, while the wild type germ cells developed in a torpedo deficient female showed ventralized egg. Some of the following statements are drawn from the above experiments and some from known facts to understand the functioning of Torpedo. A. Zygotic contribution of Torpedo is essential for the development of dorso- ventral axis. B. Maternal contribution of Torpedo is essential for the development of dorso- ventral axis. C. Since Torpedo is a receptor for Gurken and follicle cells surround the part of the oocyte where Gurken is expressed, it is likely that Torpedo is expressed in follicle cells. D. Gurken signalling initially dorsalizes the follicle cells, which in turn send signal to organize the dorso- ventral polarity in oocyte. E. Gurken signalling initially dorsalizes the nurse cells which help in generation of dorso-ventral polarity in oocyte. Which one of the following combination of statements is most appropriate? (1) B, C and D (2) A, C and D (3) B, C and E (4) A, D and E

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

admin
November 8, 2025
6 Comments

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 […]

25. 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 of the Dorsal Protein. In an experiment, Drosophila germ line chimeras were made by interchanging pole cells (germ line precursors) between wild type embryos and embryos from mother homozygous for a mutation of torpedo gene. These transplants produced: i) wild type females whose egg came from mutant mother, and ii) torpedo deficient females whose egg came from wild type mother. The possible outcome of this experiment can be: A. Torpedo deficient eggs developed in wild type ovary induced normal embryos. B. Wild type eggs developed in Torpedo deficient ovary produced ventralized embryos. C. Torpedo deficient eggs developed in wild type ovary produced ventralized embryos. D. Dorsal protein enters in the nuclei of dorsal side of embryos which came from wild type eggs developed in Torpedo deficient ovary. E. Dorsal protein remains cytoplasmic in the dorsal side of the embryos which came from Wild type eggs developed in Torpedo deficient ovary. Which of the above combination is correct? (1) A, B and D (2) B, C and E (3) B, D and E (4) A, C and E

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

admin
November 8, 2025
2 Comments

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 […]

24. 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. A. In embryos that lack Gurken protein, the Dorsal protein is not translocated to the nucleus of the follicle cells which then causes ventralization of the embryo B. Though Dorsal protein acts as a morphogen, it is found throughout the syncytial blastoderm of the early Drosophila embryo. C. In embryos that lack Cactus protein the Dorsal protein can be found in the nucleus of cells with a ventral fate. D. If the Dorsal protein is blocked from entering the nucleus, the genes responsible for specifying dorsal cell types are not transcribed. Which of the above statements are correct? (1) A and B (2) B and C (3) C and D (4) A and C

CSIR NET Life Science Previous Year Questions and Solution on Development Biology

Role of Dorsal Protein in Establishing Dorsal-Ventral Polarity in Drosophila Embryos

admin
November 8, 2025
10 Comments

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. […]

Tag: CSIR NET Life Science Free Test on Drosophila Development

Trans-determination in Drosophila Imaginal Discs: Understanding Developmental Plasticity and Cell Fate Switching

Categorization and Matching of Developmental Genes in Drosophila Embryogenesis

Ultrabithorax Gene Deletion Phenotype in Drosophila: A Detailed Analysis

Function and Mutation Effects of the Antennapedia Gene in Drosophila Development

Molecular Basis of Wing-to-Haltere Transformations in Drosophila: The Role of Ultrabithorax and Homeotic Genes

Understanding Dorsal-Ventral Patterning in Drosophila Embryos: Key Molecular Mechanisms

Impact of Homeotic Gene Mutations on Drosophila Embryonic Development

Role of Torpedo Receptor and Gurken Signaling in Dorsal-Ventral Axis Formation in Drosophila

Role of Torpedo Receptor and Gurken Protein Interactions in Dorsal-Ventral Axis Formation in Drosophila Germ Line Chimera Experiments

Role of Dorsal Protein in Establishing Dorsal-Ventral Polarity in Drosophila Embryos

Latest Courses

CSIR UGC NET Life Science Course

ICMR JRF Life Science

IIT JAM / CUET- PG