Gene Flow, Gene Transfer, Immigration & Emigration in Evolution | GRADE 12 BIOLOGY | New Curriculum

Learn in the first 15 seconds how gene flow changes genetic diversity when organisms move from one population to another and why this concept frequently appears in exam questions. This Grade 12 Biology lesson from the New Ethiopian Curriculum textbook explains gene flow, immigration, emigration, genetic variability, horizontal gene transfer, and vertical gene transfer. Designed for Ethiopian University Entrance Exam (EUEE) preparation, this lesson helps Grade 12 students master key evolution and genetics concepts that are commonly tested in national examinations. VIDEO TIMESTAMPS 00:00 - River Mixing Analogy for Gene Flow 00:33 - Introduction to Gene Flow 00:41 - What is Gene Flow? 01:06 - Genetic Diversity and Population Variation 01:46 - Examples of Gene Flow in Plants 02:01 - Pollen Dispersal and Movement of Genes 02:26 - Immigration and Emigration Overview 02:44 - Immigration and Population Change 03:08 - How Immigration Increases Genetic Diversity 03:40 - How Emigration Reduces Genetic Diversity 04:24 - Gene Flow and Evolution Questions 04:42 - Migration as a Cause of Gene Flow 05:20 - Transfer of Genetic Material Explained 05:53 - Gene Flow vs Gene Transfer 06:44 - Horizontal Gene Transfer 07:15 - Bacterial Conjugation Process 07:28 - Plasmid Transfer Between Bacteria 08:21 - Horizontal Gene Transfer Applications 08:48 - Human Insulin Production Using Bacteria 09:05 - Gene Transfer vs Gene Flow Comparison 09:24 - Vertical Gene Transfer 09:42 - Gene Transfer Through Reproduction 10:13 - Horizontal vs Vertical Gene Transfer 10:21 - Inheritance from Parents to Offspring 10:43 - Effects on Genetic Diversity 10:48 - Review: Immigration and Emigration 10:56 - Review: Horizontal and Vertical Gene Transfer 11:03 - Importance in Evolution and Genetics 11:11 - Final Summary and Conclusion #Grade12Biology #GeneFlow #Genetics #Evolution #EUEE #NewCurriculumEthiopia