GCSE Biology - Genetic Diagrams | Punett Squares (2026/27 exams) скачать в хорошем качестве

GCSE Biology - Genetic Diagrams | Punett Squares (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. Introduction to Genetic Diagrams Showing combinations of alleles from two parents. 2. Representing Alleles Using letters (capital for dominant, lowercase for recessive). Example gene: mouse muscularity (Normal vs Muscular). 3. How to Draw Genetic Diagrams (5 Key Steps) Parents' phenotype and genotype. Gametes' genotype. Offsprings' genotype and phenotype. 4. Example 1: Crossing Homozygous Parents Homozygous normal (AA) crossed with homozygous muscular (aa). Determining gametes and offspring genotypes (all heterozygous Aa). Determining offspring phenotypes (all normal). 5. Introduction to Punnett Squares An alternative method for showing genetic crosses. 6. Example 2: Crossing Heterozygous Parents (using Punnett Square) Heterozygous (Aa) crossed with heterozygous (Aa). Determining offspring genotypes (AA, Aa, aa). Determining offspring phenotypes (Normal, Muscular). 7. Ratios and Probabilities Calculating phenotype ratios (e.g., 3:1 normal to muscular). Calculating probability (e.g., 25% chance of muscular offspring). 8. Example 2 Revisited: Using a Genetic Diagram Showing the heterozygous cross using the standard diagram format. 9. Important Considerations Most characteristics are controlled by multiple genes interacting. Environmental factors also influence phenotype. ** CHAPTERS ** 0:00 What Genetic Diagrams Show 0:17 Representing Genes and Alleles (Dominant/Recessive) 1:02 Drawing a Genetic Diagram: The 5 Steps 1:15 Homozygous Cross - Parents 2:11 Determining Gametes 2:33 Offspring Genotypes and Phenotypes 3:21 Punnett Squares Explained 4:22 Heterozygous Cross - Punnett Square 4:59 Understanding Phenotype Ratios and Probabilities 5:37 Heterozygous Cross - Using a Genetic Diagram 6:26 Interactions & Environment ** PLAYLISTS **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #GCSE #Biology #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE