During metaphase I of meiosis, chromosome tetrads line up along the middle of the cell. In other words, during metaphase I of meiosis, the chromosome tetrads line up along the metaphase plate. During metaphase II of meiosis, the replicated chromosomes line up along the metaphase plate.
Meiosis is a type of cell division that results in sex cells (also known as gametes). During meiosis, one parent cell is divided into four gametes. This is made possible because there are two rounds of division that occur during meiosis. However, the genetic material of the parent cell is only replicated once. Thus, the four gametes that result only have half of the genetic material that the parent cell has. In other words, meiosis results in four haploid gametes.