Shell Coiling in Snails | Maternal Effect Inheritance NEET Biology Class 12 | Neela Bakore Tutorials

◀ PREVIOUS VIDEO (27/36): Kappa Particle Inheritance in Paramoecium    • Kappa Particle Inheritance in Paramoecium ...   ▶ CURRENT VIDEO (28/36): Shell Coiling in Snails (Maternal Effect)    • Shell Coiling in Snails | Maternal Effect ...   ▶ NEXT VIDEO (29/36): Linkage & Gene Mapping    • Linkage & Gene Mapping | Morgan Experiment...   🔗 Full Playlist:    • Плейлист   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Coiling direction depends on the MOTHER'S genotype — classic Maternal Effect inheritance. 📌 Topics Covered: • Dextral (D, right) vs Sinistral (d, left) coiling in Limnaea • The one-generation lag phenomenon • Full genotype–phenotype cross analysis • Maternal Effect vs Cytoplasmic Inheritance • NEET MCQ approach ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Transcript with Timestamp 0:00 Introduction — 3rd example of cytoplasmic inheritance: Shell coiling in snails 0:21 Studied in Limnaea peregra 1:00 Two types of coiling: Dextral (dominant D, right/clockwise) vs Sinistral (recessive d, left/anticlockwise) 2:30 Dextral female's eggs carry the coiling protein in cytoplasm; Sinistral female's eggs carry none 3:30 Cross 1 (Parent gen): Dextral male (DD) × Sinistral female (dd) 4:22 Zygote = Dd but cytoplasm has NO protein → all F1 sinistral 5:28 If F1 female produces eggs → she HAS dominant D → produces protein → eggs carry protein 5:54 F1 cross: sinistral male × sinistral female (all Dd) 7:49 F2: all 4 offspring receive eggs WITH protein → all 4 DEXTRAL (genotypes 1DD:2Dd:1dd) 9:50 The dd individual is dextral BUT its offspring will be sinistral (dd cannot make protein) 6:39 Concept: PREDETERMINATION — shell coiling pre-decided by mother's genotype 12:47 Summary — 4 examples of cytoplasmic inheritance 12:56 Example 1: Mirabilis jalapa (plastid inheritance) — Correns 13:33 Example 2: Kappa particle in Paramecium — Sonneborn 13:51 Example 3: Shell coiling in Limnaea peregra 13:54 Example 4: Male sterility in Zea mays — Rhoades ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Amazon Brand Store at https://www.amazon.in/neelabakoretuto.... Complete Study Notes (11th and 12th) are available at: https://amzn.to/3K4Li7k Complete Study Notes for 12th are available at: https://amzn.to/3PRhWjm Complete Study Notes for 11th are available at: https://amzn.to/4uw1hBa The study notes for this unit Genetics & Evolution are available at https://amzn.to/2Sh27jW The study notes for other units: - Diversity in Living World - https://amzn.to/3r8qkyH Structural Organisation in Plants and Animals - https://amzn.to/3r2cxmZ Cell: Structure and Functions - https://amzn.to/2GPagcm Plant Physiology - http://amzn.to/2EZR5HS Human Physiology - http://amzn.to/2DA46ea Reproduction - https://amzn.to/2wu43eS Biotechnology - http://amzn.to/2EZyqf9 Biology in Human Welfare https://amzn.to/4dPRZd7 Ecology https://amzn.to/3RwuOvF ____________________________________________ For business inquiries: abhibakore@gmail.com ___________________________________________ #ShellCoilingSnails #MaternalEffect #NonMendelianInheritance #NEETBiology #GeneticsClass12 #NeelaBakoreTutorials