Embryological Evidences of Evolution | Biogenetic Law Recapitulation | NEET Class 12 | Neela Bakore

◀ PREVIOUS VIDEO (5/22): Morphological & Anatomical Evidences – Part 2    • Morphological & Anatomical Evidences Part ...   ▶ CURRENT VIDEO (6/22): Embryological Evidences    • Embryological Evidences of Evolution | Bio...   ▶ NEXT VIDEO (7/22): Palaeontological Evidences – Part 1    • Palaeontological Evidences of Evolution Pa...   🔗 Full Playlist:    • Playlist   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ All vertebrate embryos look strikingly similar early in development — and that's no coincidence! This video explains embryological evidences of evolution for NEET. 📌 Topics Covered: • What are Embryological Evidences? • Biogenetic Law (Haeckel, 1866): "Ontogeny recapitulates Phylogeny" Ontogeny = individual development; Phylogeny = evolutionary history • Similarities in early embryos of fish, amphibia, reptiles, birds, mammals: Gill slits in all vertebrate embryos Two-chambered heart initially in all Similar notochord, limb buds • Von Baer's observations — general features appear before special ones • Limitations of Haeckel's recapitulation theory • NEET MCQ patterns on embryological evidences ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Transcript with Timestamp 0:07 Second category: embryological evidences 0:42 Example 1: early development in triploblastic organisms is similar — platyhelminthes to mammals 1:34 Process: zygote → cleavage → blastula → gastrula → 3 germ layers (endoderm, ectoderm, mesoderm) 2:32 Similar early development in highly evolved organisms = evolved from less evolved 2:52 Example 2: early embryonic development in vertebrates (fishes to mammals) 3:19 All vertebrate embryos have tail, gill slits, same eye/ear bud development in early stages 4:21 Fishes: gill slits become gills; amphibians onwards: gill slits replaced by lungs 4:33 Tail retained up to reptiles/birds; some mammals lost it 4:58 Example 3: egg tooth in birds — no teeth in adults but embryo has egg tooth = reptilian structure 5:55 That is why birds are called glorified reptiles 6:30 Example 4: Recapitulation theory — proposed by Von Baer 6:57 General structures develop first, then special structures 7:26 General structures: brain, spinal cord, axial skeleton, aortic arches 7:58 Special structures: feathers (birds), hair (mammals) — develop later 8:42 Modified by Ernst Haeckel = Biogenetic Law 9:27 Biogenetic Law: Ontogeny repeats Phylogeny 9:44 Ontogeny = individual's development; Phylogeny = ancestral development 11:34 Example 5: organ development — 4-chambered heart develops as 2 → 3 → 4- chambered; same in brain and kidneys ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 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: [email protected] ___________________________________________ #EmbryologicalEvidences #BiogeneticLaw #RecapitulationTheory #Haeckel #EvolutionNEET #Class12Biology #neelabakoretutorials