meiosis

• meiosis results in 4 haploid cells
• contains 22 chromosomes and 1 sex chromosome
• prophase 1: homologous chromosome pair up called synapsis forming a tetrad
• prophase 1: crossing over happens in the area called chiasmata, each pair of homologous chromosome is only attached to 1 spindle fiber
• metaphase 1: tetrads line up, 2n, homologous chromosomes move to opposite sides
• anaphase 1: homologous chromosome split up
• telophase 1: cleavage furrow is formed
• cytokinesis: 2 haploid cells are formed, chromosomes are still in pairs
• prophase 2: chromatids are not identical anymore, nucleolus dissapears, 2 cells that contain half the amount of chromosome (2n)
• metaphase 2: chromatid line up, n, sister chromatids finally separate and move to opposite sides
• telophase 2: nuclear envelope assembles, chromosomes decondense, spindle dissapears, cytokinesis divides cell into 2