Drosophila Dorsal Ventral Axis | Developmental Biology | CSIR DBT JRF 2026 | Lec-25 | IFAS

Drosophila Dorsal Ventral Axis | Developmental Biology | CSIR DBT JRF 2026 | Lec-25 | IFAS explained with clear concepts and exam-focused approach. Master Drosophila dorsal‑ventral axis signaling, Gurken‑Torpedo pathway, and Toll‑Cactus cascade for CSIR DBT JRF with mutant analysis tricks and problem‑solving.

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⏳ Lecture Timeline:
[00:00:11] – Introduction (Dorso‑Ventral Axis)
[00:02:10] – DPP Review & Batch Info
[00:07:43] – Dorsal Activates Ventral Fate Genes (Twist, Snail, Rhomboid)
[00:13:18] – Axis Determination: Oocyte Nucleus & Gurken mRNA
[00:15:22] – Dorsal Inhibits DPP/Tolloid/Zerknüllt on Ventral Side
[00:17:23] – Step 1: Oocyte Nucleus Migration & Gurken Localisation
[00:20:25] – Post‑Fertilisation: Pipe Sulphation & Protease Cascade
[00:24:15] – Recap: Dorsal Follicle Fate from Gurken/Torpedo Signal
[00:32:06] – Question 1: Maternal Deficiency Gurken/Torpedo → Ventralised
[00:34:02] – Question 2: Cactus Loss‑of‑Function → Ventralised
[00:37:40] – Question 3: Identify Embryo Types (Dorsalised/Ventralised/Normal)
[00:51:05] – Question 4: Number of Nuclear Divisions (13)
[00:51:31] – Question 5: Determination vs Specification Stage
[00:52:55] – Question 6: Twist Expression with Uniform Spätzle
[01:00:22] – Conclusion: Torpedo Function in Somatic Follicle Cells, Not Germline
[01:06:51] – Question 7: Female Gurken Mutant → Ventralised Progeny
[01:09:02] – DPP Quiz (11 Questions on Axis & Segment Polarity)
[01:11:12] – Complete Session (Dorso‑Ventral Axis & Drosophila Development)

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📖 Topics Covered in This Lecture:
• Gurken‑Torpedo‑Pipe signaling pathway
• Dorsal protein gradient & morphogen action
• Cactus, Toll, Tube, Pelle kinase cascade
• Twist, Snail, Rhomboid ventral fate genes
• Ventralization vs dorsalization mutant PYQ
• Jump line chimera experiment concept
• Follicle cell somatic gene requirement tricks

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📚 Lecture Summary:
In this session, IFAS Expert Faculty focuses on Drosophila dorsal‑ventral axis determination. Key concepts covered: Gurken mRNA localization, Torpedo receptor activation on follicle cells, Pipe synthesis inhibition establishing dorsal fate, and the ventral signaling cascade (GD‑Snake‑Easter‑Spätzle‑Toll‑Pelle) that degrades Cactus, releasing Dorsal protein to activate ventral genes. Mutant analysis tricks distinguish ventralization (Gurken/Torpedo loss) from dorsalization (Dorsal/Toll loss). The jump line chimera experiment clarifies somatic follicle cell vs. germ line requirement. This session repeatedly links Drosophila dorsal‑ventral axis mechanisms to CSIR DBT JRF PYQ patterns.

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✅ CSIR NET Life Science ✅ GATE Life Science ✅ GATE Biotechnology
✅ GATE Ecology & Evolutuon ✅ BET (DBT) ✅DHR ICMR (BRET)
✅ TIFR Biology  ✅ BARC Bioscience  ✅ SET / PhD Entrance Exams

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