16MEIOSIS REPRODUCTION OF SEX CELLS PRODUCES 4 GENETICALLY DIFFERENT HAPLOID GAMETES
17InterphaseCell Grows & Prepares for DivisionDNA is Replicated
18Meiosis IProphase IMetaphase IAnaphase ITelophase I
19Meiosis II 2 Stages of Division Prophase II Metaphase II Anaphase II HAPLOID4Prophase IIMetaphase IIAnaphase IITelophase II
20 Synapsis/Tetrad = Homologous Chromosomes Pair Up & Cross Over Crossing Over Synapsis/Tetrad = Homologous Chromosomes Pair Up & Cross OverCrossing Over begins during Prophase I & ends during Anaphase ICrossing Over is important becauseIt increases Genetic DiversityIt ensures that all cells produced during meiosis are DifferentIt Unlinks genes
29Human Gametes normally have 23 chromosomes. Human Body Cells normally have 46 chromosomes (23 pairs).
30What is this disorder called? Down’s Syndrome OR Trisomy 21 This is caused by Nondisjunction.Nondisjunction can occur during Anaphase I OR Anaphase II of meiosis if the chromosomes do not SEPARATE correctly.
31Stage of Meiosis = Anaphase I Stage of Meiosis = Anaphase II Too Many Chromosomes
32Homologous Chromosomes Line Up in the Middle/Equator Crossing OverHomologous Chromosomes Line Up in the Middle/EquatorChromosomes Line Up in the Middle/EquatorHomologous Chromosomes SeparateSister Chromatids SeparateDiploidHaploid42Identical Body CellsGenetically Different Gametes (sex cells)