| Mitosis | nuclear division |
| Interphase | 'resting' |
| Prophase | chromosomes appear |
| Metaphase | chromosomes on equator |
| Anaphase | chromatids separate chromatids move |
| Telophase | nuclei reform |
| Interphase | 'resting' |
| Cytokinesis | cell plate forms on equator cell divides |
This model suggests that the cell spends 4/5 of its life reproducing.
In reality, the "typical" cell spends only approximately 10% of its life reproducing.
| The Cell Life Cycle | ||||
| phase | duration % life span |
activities | DNA material | lapse time |
| G-1 | 40% | DNA transcription growth energy |
2n chromosomes 1 chromatid each |
40% |
| S-1 | 20% | DNA replication cell shut down |
2n chromosomes 2 chromatids each |
60% |
| G-2 | 30% | DNA transcription energy |
2n chromosomes 2 chromatids each |
90% |
| division | 8% 2% |
mitosis cytokinesis |
2n chromosomes 1 chromatid each |
98% 100% |
| Mitosis | nuclear division | chromosomes | chromatids |
| Interphase [G-2] | normal | 2n | 2 |
| Prophase | chromosomes appear | 2n | 2 |
| Metaphase | chromosomes on equator | 2n | 2 |
| Anaphase | chromatids separate chromatids move |
4n | 1 |
| Telophase | nuclei reform | 2 * 2n | 1 |
| Cytokinesis | cell plate forms on equator cell divides |
||
| Interphase [G-1] | normal | 2n | 1 |
| Interphase [S-1] | normal | 2n | 2 |
| Interphase [G-2] | normal | 2n | 2 |
RETURN TO OUTLINE
© 2004-2005 TwoOldGuys ™
revised 30 oct 2006