click below
click below
Normal Size Small Size show me how
Cell division SG
| Question | Answer |
|---|---|
| Cell cycle consists of? | interphase and M phase (IPMAT), cytokinesis |
| List the events occurring during: Interphase, G1 phase | synthesis of various enzymes required in S phase- mainly for DNA replication |
| Interphase, S phase | DNA synthesis commences, all chromosomes replicated --> sister chromatids |
| Interphase, G2 phase | production of microtubules |
| Prophase | 1. Chromatin threads condense, coil and shorten to become chromosomes. 2. centrioles move apart to opposite poles 3. nucleolus and nuclear envelope disappears. 4. spindle fibres extends from one pole of cell to the other. |
| Metaphase | -chromosomes line up around equator of spindle. -centromere of each chromosomee attached to spindle fibre. |
| Anaphase | Each centromere splits. Spindle fibres pull chromatids apart to opposite poles.--> becomes daughter chromosomes |
| Telophase | Spindle fibre breaks down. Nuclear envelope forms around chromosomes at each pole. Nucleolus forms and chromosomes uncoil and lengthen to become chromatin threads. |
| Cytokinesis | Division of cytoplasm. cleavages/ furrows appear. Identical cells produced. |