Upper row: side view along the equatorial plane. Lower row: polar view.
At metaphase I (Gr.meta=in the midth) the nuclear envelop and nucleoli have now disappeared and each pair of homolog chromosomes moves to the equatorial plane, with the centromeres protruding at each side of this plane. The two centromeres of any homolog pair of chromosomes are attached each to spindle microtubules reaching opposite poles.[/ned]