Diplos means two or two and tene means thread. At this stage the chromosomes become shorter and thicker through continuous contraction. In bivalents, the attraction between the homologous chromosomes decreases and repulsion begins instead. Repulsion is usually observed first and most extensively within the centromere. As a result of repulsion, the chromosomes move away from each other. However, homologous chromosomes may not be completely separate. Chromosomes moving apart is called disjunction. A loop or loop is formed in the bivalent in the presence of two atoms. The clay gradually moves towards the edges. Moving towards the edge of the material is called terminalization. At this time two or more arms are rotated by 90 degree angle. But if there is a kayazma, the arms can rotate through 180 degree angle. Towards the end of this stage, the number of kayazmata decreases. Absence of the nucleolus is indicated although the nuclear membrane is intact.
Oocytes in human oocytes are arrested in the diplotene stage during embryonic stage. This condition is called dicotyledonous condition. Under the influence of luteinizing hormone, the diktyoten phase ends. Dr. Siddique Publications