The purpose of meiosis is to create 4 gametes/sex cells that are haploid from a diploid parent cell. In meiosis, there are two rounds of cell division, one after Meiosis I and another after Meiosis II. During Prophase I of Meiosis I, each replicated chromosome pairs with its corresponding homologous chromosome which is called a tetrad. These tetrads than crossover where the cross sections of chromatids are exchanged which produces a new combination of alleles in the cell. Than in metaphase I, paired homologous chromosomes line up across the center of the cell.