Polygenic Inheritance | Skin Colour Height in Humans | NEET Class 12 | Neela Bakore

◀ PREVIOUS VIDEO (13/36): Duplicating Genes (15:1)    • Duplicating Genes 15:1 Ratio | Duplicate D...   ▶ CURRENT VIDEO (14/36): Polygenic Inheritance    • Polygenic Inheritance | Skin Colour Height...   ▶ NEXT VIDEO (15/36): Epistasis (9:3:4 & 12:3:1)    • Epistasis | Recessive Epistasis 9:3:4 & Do...   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔗 Full Playlist:    • Playlist   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Many genes → one continuously varying trait. Polygenic Inheritance: skin colour and height explained. 📌 Topics Covered: • What is Polygenic Inheritance? • Human skin colour — melanin-producing genes • Height as a polygenic trait • Bell-curve (normal distribution) in polygenic traits • Polygenic vs Pleiotropic inheritance • Environment and gene interaction ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Transcript with timestamp 0:00 Introduction — Polygenic Inheritance = Quantitative Inheritance 0:31 Example: Skin colour in humans — 3 genes (A, B, C) 0:57 Number of dominant alleles determines melanin production 1:10 6 dominant → maximum melanin → black; 0 dominant → albino 4:36 Davenport explained skin colour polygenic inheritance 5:23 Scale: 6D=black, 5D=very dark, 4D=dark, 3D=intermediate, 2D=fair, 1D=very fair, 0D=albino 6:02 Cross: AABBCC (black) × aabbcc (albino) → F1 all AaBbCc = intermediate 7:01 F2 selfing of F1 (AaBbCc × AaBbCc) 8:31 8 types of gametes produced 16:58 F2 ratio: 1:6:15:20:15:6:1 (bell-shaped distribution) 20:11 Bell-shaped curve when graph plotted — characteristic of polygenic inheritance ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 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] ___________________________________________ #PolygenicInheritance #SkinColourGenetics #QuantitativeInheritance #NEETBiology #GeneticsClass12 #NeelaBakoreTutorials