Prophase: each chromosome has a two part structure consisting of sister chromatids joined by a centromere. Metaphase: the chromosomes randomly align at the metaphase plate perpendicular to the spindle. Anaphase: the sister chromatids are pulled to opposite poles of the cell by the spindle fibers. Telophase: the separated sets of chromosomes become enclosed in a nuclear membrane. The two cells that are the result of this mitotic division are genetically identical to the original cell at the left. Alignment 1 of homologous chromosomes at metaphase 1 of meiosis. There is no crossing over of sister chromatids. Metaphase 1: homologous chromosomes pair and align at the metaphase plate in an alignment that determines the maternal and paternal chromosome complement of the resulting gametes. Anaphase 1: maternal chromosomes go to one pole of the dividing germ cell, and the paternal chromosomes go to the other pole. Telophase 1: the two meiotic products progress through prophase 2, metaphase 2, and anaphase 2.
