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Meiosis is used in sexual reproduction to make genetically diverse gametes genetically diverse individuals MEIOSIS The production of eggs and sperm The “Reduction Division ” Mother Cell (2n) Starts with 46 Gamete (1n) Ends with 23 Media Links\13_08Meiosis.mpg Pre- Germ Cell OR Pre-Reproductive Cell Mother Cell is diploid 2n = 46 BUT in this cartoon version ……… 2n= 4 Interphase Pre-Reproductive Cell Prophase I Media Links\13-07b-ProphaseI.mov Prophase I Sister Non-Sister Chromatids Chromatids Synapsis - Homologous Pairs of chromosomes come together Tetrad – 4 homologous chromatids Media Links\13-10CrossingOver. mov Metaphase I Media Links\13-07c-MetaphaseI.mov Anaphase I Media Links\13-07d-AnaphaseI.mov Telophase I Media Links\13-07eTelophaseICytokin.mov Cytokinesis occurs Meiosis I Summary 1. Crossing Over Occurred (Ensures Genetic Variation) 2. Separated the Homologous Pair of Chromosomes Cell went from 2N to 1N (ds) 3. Started as 2N = 46 (ds), ended as N = 23 (ds) Interkinesis – Meiosis Intermission Are these cells 1N or 2N? Prophase II Metaphase II chromosomes (ds) align on equator Anaphase II Telophase II Media Links\13-07f-MeiosisIICytokin.mov Gametes Meiosis II Summary 1. Separated the chromatids, Centromeres broke 2. 2 temporary daughter cells went from Haploid (ds) to Haploid (ss) 3. Started as n = 23 (ds) ended as n = 23 (ss) Media Links\13_08Meiosis.mpg And Now It Is Time To Start The Meiosis Lab... Grab your Chromosomes Cups and begin!!!!!