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Biology 3rd Block Room 128 Mr. R. Bair Biology Teacher Mrs. MV Smith Resource Teacher Date: October 24, 2007 Drill Why is meiosis important in reproduction? What is pulled apart in Anaphase I? What is pulled apart in Anaphase II? 1. 2. 3. Meiosis: makes cells with ½ of the DNA so that when sperm and egg combine the zygote (fertilized egg) has the proper # of chromosomes. Homologous Pairs (tetrad) Chromotids Mitosis 5 phases IPMAT Makes 2 Diploid Makes body cells Somatic 1 division Both directed by asters Both use IPMAT After IPMAT in Meiosis The processes are the same Meiosis 9 phases IPMATcPMATc Makes 4 Haploid Cells Makes sperm & Eggs Sex cells 2 divisions Tetrads form crossover occurs
