Cell division consists of nuclear division and cytoplasmic division. Karyokinesis is the stage of nuclear division and divided into four stages, prophase, metaphase, anaphase and telophase. Interphase is a stage prior to karyokinesis. It has three phase G1,S,G2. Replication of centriole occurs during G1- phase of interphase. DNA replication takes place in S-phase of inter phase.