| Term | Definition |
| interphase | period between cell divisions; chromosomes not visible under light microscope |
| g1 phase | metabolically active cell duplicates organelles and cytosolic components; replication of chromosomes begins. |
| s phase | replication of DNA and centrosomes |
| g2 phase | cell growth, enzyme and proteinsynthesis continues; replication of centrosomes complete. |
| mitotic phase | parent cell produces identical cells with identical chromosomes; chromosomes visible under light microscope. |
| mitosis | nuclear division;distribution of two sets of chromosomes into separate nuclei |
| prophase | chromatin fibers condense into paired chromatids; nucleolus and nuclear envelope disappear; each centrosome movesto an opposite pole of the cell |
| metaphase | centromeres of chromatid pairs line up at metaphase plate |
| anaphase | centromeres split; identical sets of chromosomes moe to opposite poles of cell |
| telophase | nuclear envelopes and nucleoli reappear;chromosomes resume chromatin form;mitotic spindle disappears |
| cytokinesis | cytoplasmic division; contractile ring forms cleaevage furrow around center of cell, dividing cytoplasm into separate and equal portions |